diff --git a/.Rbuildignore b/.Rbuildignore
index 36da0fa..0dd210b 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -9,3 +9,4 @@
 ^\.Rprofile$
 ^packrat/
 ^to-cor-df\.png$
+revdep
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index 8b0824a..e4f23c0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,8 +4,7 @@ language: R
 sudo: false
 cache: packages
 
-r_github_packages:
-  - jimhester/covr
-
-after_success:
-  - Rscript -e 'covr::codecov()'
\ No newline at end of file
+include:
+  - r: release
+  - r: oldrel
+  - r: devel
diff --git a/DESCRIPTION b/DESCRIPTION
index 892c28a..0adf5ca 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: corrr
 Type: Package
-Version: 0.2.1.9000
+Version: 0.3.0
 Title: Correlations in R
 Description: A tool for exploring correlations.
     It makes it possible to easily perform routine tasks when
@@ -16,8 +16,7 @@ Authors@R: c(
 URL: https://github.com/drsimonj/corrr
 BugReports: https://github.com/drsimonj/corrr/issues
 Depends: 
-    R (>= 3.3.0),
-    dplyr (>= 0.5.0)
+    R (>= 3.3.0)
 LazyData: yes
 License: MIT + file LICENSE
 RoxygenNote: 6.0.1
@@ -29,6 +28,7 @@ Suggests:
     DBI,
     RSQLite
 Imports: 
+    dplyr (>= 0.5.0),
     magrittr (>= 1.5),
     tidyr (>= 0.5.1),
     ggplot2 (>= 2.2.0),
diff --git a/NEWS.md b/NEWS.md
index 69fb2a7..cc710b8 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,4 +1,4 @@
-# corrr 0.2.1.9000
+# corrr 0.3.0
 
 ## Small breaking changes
 
@@ -28,6 +28,8 @@ The `diagonal` argument of `as_matrix` and `as_matrix.cor_df` is now an optional
 
 - During the development of this version, ggplot v2.2.0 was released. Many changes in the plotting functions have been made to handle new features in the updated version of ggplot2.
 
+- Improvements to the package folder structure
+
 # corrr 0.2.1
 
 ## New Functionality
diff --git a/R/output.R b/R/output.R
index 10db122..f9e2948 100644
--- a/R/output.R
+++ b/R/output.R
@@ -12,6 +12,7 @@
 #' @export
 #' @examples 
 #' # Examples with correlate()
+#' library(dplyr)
 #' mtcars %>% correlate() %>% fashion()
 #' mtcars %>% correlate() %>% fashion(decimals = 1)
 #' mtcars %>% correlate() %>% fashion(leading_zeros = TRUE)
diff --git a/R/reshape.R b/R/reshape.R
index 6988e7c..7c6e84a 100644
--- a/R/reshape.R
+++ b/R/reshape.R
@@ -16,6 +16,7 @@
 #' @return A tbl or, if mirror = TRUE, a cor_df (see \code{\link{correlate}}).
 #' @export
 #' @examples
+#' library(dplyr)
 #' x <- correlate(mtcars)
 #' focus(x, mpg, cyl)  # Focus on correlations of mpg and cyl with all other variables
 #' focus(x, -disp, - mpg, mirror = TRUE)  # Remove disp and mpg from columns and rows
@@ -48,6 +49,7 @@ focus_ <- function(x, ..., .dots, mirror) {
 #' @return A tibble or, if mirror = TRUE, a correlation data frame.
 #' @export
 #' @examples
+#' library(dplyr)
 #' any_greater_than <- function(x, val) {
 #'   mean(abs(x), na.rm = TRUE) > val
 #' }
diff --git a/README-combination-1.png b/README-combination-1.png
deleted file mode 100644
index 6d2b2a2..0000000
Binary files a/README-combination-1.png and /dev/null differ
diff --git a/README-combination-2.png b/README-combination-2.png
deleted file mode 100644
index 8a283ff..0000000
Binary files a/README-combination-2.png and /dev/null differ
diff --git a/README.Rmd b/README.Rmd
index ae03c0c..e14da00 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -8,7 +8,7 @@ output: github_document
 knitr::opts_chunk$set(
   collapse = TRUE,
   comment = "#>",
-  fig.path = "README-"
+  fig.path = "tools/readme/"
 )
 ```
 
@@ -24,7 +24,7 @@ knitr::opts_chunk$set(
 
 corrr is a package for exploring **corr**elations in **R**. It focuses on creating and working with **data frames** of correlations (instead of matrices) that can be easily explored via corrr functions or by leveraging tools like those in the [tidyverse](http://tidyverse.org/). This, along with the primary corrr functions, is represented below:
 
-<img src='to-cor-df.png'>
+<img src='tools/readme/to-cor-df.png'>
 
 You can install:
 
diff --git a/README.md b/README.md
index bf1dc63..7049d5d 100644
--- a/README.md
+++ b/README.md
@@ -1,59 +1,85 @@
+
 <!-- README.md is generated from README.Rmd. Please edit that file -->
 
 # corrr <img src="man/figures/logo.png" align="right" />
 
-[![Project Status: Active ? The project has reached a stable, usable state and is being actively developed.](http://www.repostatus.org/badges/latest/active.svg)](http://www.repostatus.org/#active) [![minimal R version](https://img.shields.io/badge/R%3E%3D-3.3.0-6666ff.svg)](https://cran.r-project.org/) [![CRAN\_Status\_Badge](http://www.r-pkg.org/badges/version/corrr)](https://cran.r-project.org/package=corrr) [![packageversion](https://img.shields.io/badge/Package%20version-0.2.1.9000-orange.svg?style=flat-square)](commits/master) [![Last-changedate](https://img.shields.io/badge/last%20change-2017--02--03-yellowgreen.svg)](/commits/master) [![Build Status](https://travis-ci.org/drsimonj/corrr.svg?branch=master)](https://travis-ci.org/drsimonj/corrr) [![Downloads](http://cranlogs.r-pkg.org/badges/grand-total/corrr)](http://cran.rstudio.com/web/packages/corrr/index.html)
-
-corrr is a package for exploring **corr**elations in **R**. It focuses on creating and working with **data frames** of correlations (instead of matrices) that can be easily explored via corrr functions or by leveraging tools like those in the [tidyverse](http://tidyverse.org/). This, along with the primary corrr functions, is represented below:
-
-<img src='to-cor-df.png'>
+[![Project Status: Active ? The project has reached a stable, usable
+state and is being actively
+developed.](http://www.repostatus.org/badges/latest/active.svg)](http://www.repostatus.org/#active)
+[![minimal R
+version](https://img.shields.io/badge/R%3E%3D-3.3.0-6666ff.svg)](https://cran.r-project.org/)
+[![CRAN\_Status\_Badge](http://www.r-pkg.org/badges/version/corrr)](https://cran.r-project.org/package=corrr)
+[![packageversion](https://img.shields.io/badge/Package%20version-0.2.1.9000-orange.svg?style=flat-square)](commits/master)
+[![Last-changedate](https://img.shields.io/badge/last%20change-2018--05--28-yellowgreen.svg)](/commits/master)
+[![Build
+Status](https://travis-ci.org/drsimonj/corrr.svg?branch=master)](https://travis-ci.org/drsimonj/corrr)
+[![Downloads](http://cranlogs.r-pkg.org/badges/grand-total/corrr)](http://cran.rstudio.com/web/packages/corrr/index.html)
+
+corrr is a package for exploring **corr**elations in **R**. It focuses
+on creating and working with **data frames** of correlations (instead of
+matrices) that can be easily explored via corrr functions or by
+leveraging tools like those in the [tidyverse](http://tidyverse.org/).
+This, along with the primary corrr functions, is represented below:
+
+<img src='tools/readme/to-cor-df.png'>
 
 You can install:
 
--   the latest released version from CRAN with
+  - the latest released version from CRAN with
+
+<!-- end list -->
 
 ``` r
 install.packages("corrr")
 ```
 
--   the latest development version from github with
+  - the latest development version from github
+with
+
+<!-- end list -->
 
 ``` r
 install.packages("devtools")  # run this line if devtools is not installed
 devtools::install_github("drsimonj/corrr")
 ```
 
-Using corrr
------------
+## Using corrr
 
-Using `corrr` typically starts with `correlate()`, which acts like the base correlation function `cor()`. It differs by defaulting to pairwise deletion, and returning a correlation data frame (`cor_df`) of the following structure:
+Using `corrr` typically starts with `correlate()`, which acts like the
+base correlation function `cor()`. It differs by defaulting to pairwise
+deletion, and returning a correlation data frame (`cor_df`) of the
+following structure:
 
--   A `tbl` with an additional class, `cor_df`
--   An extra "rowname" column
--   Standardised variances (the matrix diagonal) set to missing values (`NA`) so they can be ignored.
+  - A `tbl` with an additional class, `cor_df`
+  - An extra “rowname” column
+  - Standardised variances (the matrix diagonal) set to missing values
+    (`NA`) so they can be ignored.
 
 ### API
 
-The corrr API is designed with data pipelines in mind (e.g., to use `%>%` from the magrittr package). After `correlate()`, the primary corrr functions take a `cor_df` as their first argument, and return a `cor_df` or `tbl` (or output like a plot). These functions serve one of three purposes:
+The corrr API is designed with data pipelines in mind (e.g., to use
+`%>%` from the magrittr package). After `correlate()`, the primary corrr
+functions take a `cor_df` as their first argument, and return a `cor_df`
+or `tbl` (or output like a plot). These functions serve one of three
+purposes:
 
 Internal changes (`cor_df` out):
 
--   `shave()` the upper or lower triangle (set to NA).
--   `rearrange()` the columns and rows based on correlation strengths.
+  - `shave()` the upper or lower triangle (set to NA).
+  - `rearrange()` the columns and rows based on correlation strengths.
 
 Reshape structure (`tbl` or `cor_df` out):
 
--   `focus()` on select columns and rows.
--   `stretch()` into a long format.
+  - `focus()` on select columns and rows.
+  - `stretch()` into a long format.
 
 Output/visualisations (console/plot out):
 
--   `fashion()` the correlations for pretty printing.
--   `rplot()` the correlations with shapes in place of the values.
--   `network_plot()` the correlations in a network.
+  - `fashion()` the correlations for pretty printing.
+  - `rplot()` the correlations with shapes in place of the values.
+  - `network_plot()` the correlations in a network.
 
-Examples
---------
+## Examples
 
 ``` r
 library(MASS)
@@ -83,31 +109,30 @@ x <- correlate(d)
 class(x)
 #> [1] "cor_df"     "tbl_df"     "tbl"        "data.frame"
 x
-#> # A tibble: 6 × 7
-#>   rowname            v1          v2           v3            v4          v5
-#>     <chr>         <dbl>       <dbl>        <dbl>         <dbl>       <dbl>
-#> 1      v1            NA  0.70986371  0.709330652  0.0001947192 0.021359764
-#> 2      v2  0.7098637068          NA  0.697411266 -0.0132575510 0.009280530
-#> 3      v3  0.7093306516  0.69741127           NA -0.0252752456 0.001088652
-#> 4      v4  0.0001947192 -0.01325755 -0.025275246            NA 0.421380212
-#> 5      v5  0.0213597639  0.00928053  0.001088652  0.4213802123          NA
-#> 6      v6 -0.0435135083 -0.03383145 -0.020057495  0.4424697437 0.425441795
-#> # ... with 1 more variables: v6 <dbl>
+#> # A tibble: 6 x 7
+#>   rowname         v1        v2        v3         v4       v5       v6
+#>   <chr>        <dbl>     <dbl>     <dbl>      <dbl>    <dbl>    <dbl>
+#> 1 v1       NA          0.710     0.709     0.000195  0.0214   -0.0435
+#> 2 v2        0.710     NA         0.697    -0.0133    0.00928  -0.0338
+#> 3 v3        0.709      0.697    NA        -0.0253    0.00109  -0.0201
+#> 4 v4        0.000195  -0.0133   -0.0253   NA         0.421     0.442 
+#> 5 v5        0.0214     0.00928   0.00109   0.421    NA         0.425 
+#> 6 v6       -0.0435    -0.0338   -0.0201    0.442     0.425    NA
 ```
 
-As a `tbl`, we can use functions from data frame packages like `dplyr`, `tidyr`, `ggplot2`:
+As a `tbl`, we can use functions from data frame packages like `dplyr`,
+`tidyr`, `ggplot2`:
 
 ``` r
 library(dplyr)
 
 # Filter rows by correlation size
 x %>% filter(v1 > .6)
-#> # A tibble: 2 × 7
-#>   rowname        v1        v2        v3          v4          v5
-#>     <chr>     <dbl>     <dbl>     <dbl>       <dbl>       <dbl>
-#> 1      v2 0.7098637        NA 0.6974113 -0.01325755 0.009280530
-#> 2      v3 0.7093307 0.6974113        NA -0.02527525 0.001088652
-#> # ... with 1 more variables: v6 <dbl>
+#> # A tibble: 2 x 7
+#>   rowname    v1     v2     v3      v4      v5      v6
+#>   <chr>   <dbl>  <dbl>  <dbl>   <dbl>   <dbl>   <dbl>
+#> 1 v2      0.710 NA      0.697 -0.0133 0.00928 -0.0338
+#> 2 v3      0.709  0.697 NA     -0.0253 0.00109 -0.0201
 ```
 
 corrr functions work in pipelines (`cor_df` in; `cor_df` or `tbl` out):
@@ -136,7 +161,7 @@ fashion(x)
 rplot(x)
 ```
 
-![](README-combination-1.png)
+![](tools/readme/combination-1.png)<!-- -->
 
 ``` r
 
@@ -148,4 +173,4 @@ datasets::airquality %>%
 #> Missing treated using: 'pairwise.complete.obs'
 ```
 
-![](README-combination-2.png)
+![](tools/readme/combination-2.png)<!-- -->
diff --git a/README_files/figure-markdown_github/combination-1.png b/README_files/figure-markdown_github/combination-1.png
deleted file mode 100644
index f5ebab8..0000000
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diff --git a/README_files/figure-markdown_github/rplot-1.png b/README_files/figure-markdown_github/rplot-1.png
deleted file mode 100644
index dc64868..0000000
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diff --git a/README_files/figure-markdown_github/rplot_arranged-1.png b/README_files/figure-markdown_github/rplot_arranged-1.png
deleted file mode 100644
index 977b29e..0000000
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diff --git a/README_files/figure-markdown_github/rplot_arranged-2.png b/README_files/figure-markdown_github/rplot_arranged-2.png
deleted file mode 100644
index 1843d71..0000000
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diff --git a/README_files/figure-markdown_github/rplot_arranged-3.png b/README_files/figure-markdown_github/rplot_arranged-3.png
deleted file mode 100644
index 0d777e2..0000000
Binary files a/README_files/figure-markdown_github/rplot_arranged-3.png and /dev/null differ
diff --git a/README_files/figure-markdown_github/unnamed-chunk-3-1.png b/README_files/figure-markdown_github/unnamed-chunk-3-1.png
deleted file mode 100644
index 9d5bfc7..0000000
Binary files a/README_files/figure-markdown_github/unnamed-chunk-3-1.png and /dev/null differ
diff --git a/cran-comments.md b/cran-comments.md
index 75788bc..6446124 100644
--- a/cran-comments.md
+++ b/cran-comments.md
@@ -1,23 +1,26 @@
-## Test environments
-* local Windows 10 install, R 3.3.1
-* ubuntu 12.04.5 LTS (on travis-ci), R 3.3.1
-* win-builder (devel and release)
+## Release summary
 
-## R CMD check results
+- `as_cordf` will coerce lists or matrices into correlation data frames if possible
+
+- `focus_if` enables conditional variable selection
+
+- Can use arithmetic operators (e.g., `+` or `-`) with correlation data frames
+
+- `correlate()` now supports data frame with a SQL back-end (`tbl_sql`)
 
-Except for win-builder, there were no ERRORs, WARNINGs or NOTEs.
+- Small breaking change: The `diagonal` argument of `as_matrix` and `as_matrix.cor_df` is now an optional argument rather than set to `1` by default 
 
-Via win-builder, there was 1 NOTE:
+- Other improvements and fixes
+
+## Test environments
+* local Windows 10 install, R 3.5.0
+* ubuntu 14.04 (on travis-ci)
+* Ubuntu 14.04.5 LTS with RStudio Server, R 3.4.3 
+
+## R CMD check results
 
-  * checking CRAN incoming feasibility ... NOTE
-  Maintainer: 'Simon Jackson <drsimonjackson@gmail.com>'
-  
-  License components with restrictions and base license permitting such:
-    MIT + file LICENSE
-  File 'LICENSE':
-    YEAR: 2016
-    COPYRIGHT HOLDER: Simon Jackson
+- 0 errors | 0 warnings | 0 notes
 
-## Downstream dependencies
+## revdep check results
 
-There are currently no downstream dependencies for this package.
\ No newline at end of file
+- 0 packages
\ No newline at end of file
diff --git a/man/fashion.Rd b/man/fashion.Rd
index ddad5dd..94849a7 100644
--- a/man/fashion.Rd
+++ b/man/fashion.Rd
@@ -25,6 +25,7 @@ for signs) and the diagonal (or any NA) left blank.
 }
 \examples{
 # Examples with correlate()
+library(dplyr)
 mtcars \%>\% correlate() \%>\% fashion()
 mtcars \%>\% correlate() \%>\% fashion(decimals = 1)
 mtcars \%>\% correlate() \%>\% fashion(leading_zeros = TRUE)
diff --git a/man/focus.Rd b/man/focus.Rd
index dbcdcdd..a63f9cb 100644
--- a/man/focus.Rd
+++ b/man/focus.Rd
@@ -45,6 +45,7 @@ rows based on `\code{same}. For a complete list of methods for using this
 function, see \code{\link[dplyr]{select}}.
 }
 \examples{
+library(dplyr)
 x <- correlate(mtcars)
 focus(x, mpg, cyl)  # Focus on correlations of mpg and cyl with all other variables
 focus(x, -disp, - mpg, mirror = TRUE)  # Remove disp and mpg from columns and rows
diff --git a/man/focus_if.Rd b/man/focus_if.Rd
index f9175db..bf8d7a3 100644
--- a/man/focus_if.Rd
+++ b/man/focus_if.Rd
@@ -27,6 +27,7 @@ Apply a predicate function to each colum of correlations. Columns that
 evaluate to TRUE will be included in a call to \code{\link{focus}}.
 }
 \examples{
+library(dplyr)
 any_greater_than <- function(x, val) {
   mean(abs(x), na.rm = TRUE) > val
 }
diff --git a/packrat/init.R b/packrat/init.R
deleted file mode 100644
index 29aaa44..0000000
--- a/packrat/init.R
+++ /dev/null
@@ -1,217 +0,0 @@
-local({
-
-  ## Helper function to get the path to the library directory for a
-  ## given packrat project.
-  getPackratLibDir <- function(projDir = NULL) {
-    path <- file.path("packrat", "lib", R.version$platform, getRversion())
-
-    if (!is.null(projDir)) {
-
-      ## Strip trailing slashes if necessary
-      projDir <- sub("/+$", "", projDir)
-
-      ## Only prepend path if different from current working dir
-      if (!identical(normalizePath(projDir), normalizePath(getwd())))
-        path <- file.path(projDir, path)
-    }
-
-    path
-  }
-
-  ## Ensure that we set the packrat library directory relative to the
-  ## project directory. Normally, this should be the working directory,
-  ## but we also use '.rs.getProjectDirectory()' if necessary (e.g. we're
-  ## rebuilding a project while within a separate directory)
-  libDir <- if (exists(".rs.getProjectDirectory"))
-    getPackratLibDir(.rs.getProjectDirectory())
-  else
-    getPackratLibDir()
-
-  ## Unload packrat in case it's loaded -- this ensures packrat _must_ be
-  ## loaded from the private library. Note that `requireNamespace` will
-  ## succeed if the package is already loaded, regardless of lib.loc!
-  if ("packrat" %in% loadedNamespaces())
-    try(unloadNamespace("packrat"), silent = TRUE)
-
-  if (suppressWarnings(requireNamespace("packrat", quietly = TRUE, lib.loc = libDir))) {
-
-    # Check 'print.banner.on.startup' -- when NA and RStudio, don't print
-    print.banner <- packrat::get_opts("print.banner.on.startup")
-    if (print.banner == "auto" && is.na(Sys.getenv("RSTUDIO", unset = NA))) {
-      print.banner <- TRUE
-    } else {
-      print.banner <- FALSE
-    }
-    return(packrat::on(print.banner = print.banner))
-  }
-
-  ## Escape hatch to allow RStudio to handle bootstrapping. This
-  ## enables RStudio to provide print output when automagically
-  ## restoring a project from a bundle on load.
-  if (!is.na(Sys.getenv("RSTUDIO", unset = NA)) &&
-      is.na(Sys.getenv("RSTUDIO_PACKRAT_BOOTSTRAP", unset = NA))) {
-    Sys.setenv("RSTUDIO_PACKRAT_BOOTSTRAP" = "1")
-    setHook("rstudio.sessionInit", function(...) {
-      # Ensure that, on sourcing 'packrat/init.R', we are
-      # within the project root directory
-      if (exists(".rs.getProjectDirectory")) {
-        owd <- getwd()
-        setwd(.rs.getProjectDirectory())
-        on.exit(setwd(owd), add = TRUE)
-      }
-      source("packrat/init.R")
-    })
-    return(invisible(NULL))
-  }
-
-  ## Bootstrapping -- only performed in interactive contexts,
-  ## or when explicitly asked for on the command line
-  if (interactive() || "--bootstrap-packrat" %in% commandArgs(TRUE)) {
-
-    message("Packrat is not installed in the local library -- ",
-            "attempting to bootstrap an installation...")
-
-    ## We need utils for the following to succeed -- there are calls to functions
-    ## in 'restore' that are contained within utils. utils gets loaded at the
-    ## end of start-up anyhow, so this should be fine
-    library("utils", character.only = TRUE)
-
-    ## Install packrat into local project library
-    packratSrcPath <- list.files(full.names = TRUE,
-                                 file.path("packrat", "src", "packrat")
-    )
-
-    ## No packrat tarballs available locally -- try some other means of installation
-    if (!length(packratSrcPath)) {
-
-      message("> No source tarball of packrat available locally")
-
-      ## There are no packrat sources available -- try using a version of
-      ## packrat installed in the user library to bootstrap
-      if (requireNamespace("packrat", quietly = TRUE) && packageVersion("packrat") >= "0.2.0.99") {
-        message("> Using user-library packrat (",
-                packageVersion("packrat"),
-                ") to bootstrap this project")
-      }
-
-      ## Couldn't find a user-local packrat -- try finding and using devtools
-      ## to install
-      else if (requireNamespace("devtools", quietly = TRUE)) {
-        message("> Attempting to use devtools::install_github to install ",
-                "a temporary version of packrat")
-        library(stats) ## for setNames
-        devtools::install_github("rstudio/packrat")
-      }
-
-      ## Try downloading packrat from CRAN if available
-      else if ("packrat" %in% rownames(available.packages())) {
-        message("> Installing packrat from CRAN")
-        install.packages("packrat")
-      }
-
-      ## Fail -- couldn't find an appropriate means of installing packrat
-      else {
-        stop("Could not automatically bootstrap packrat -- try running ",
-             "\"'install.packages('devtools'); devtools::install_github('rstudio/packrat')\"",
-             "and restarting R to bootstrap packrat.")
-      }
-
-      # Restore the project, unload the temporary packrat, and load the private packrat
-      packrat::restore(prompt = FALSE, restart = TRUE)
-
-      ## This code path only reached if we didn't restart earlier
-      unloadNamespace("packrat")
-      requireNamespace("packrat", lib.loc = libDir, quietly = TRUE)
-      return(packrat::on())
-
-    }
-
-    ## Multiple packrat tarballs available locally -- try to choose one
-    ## TODO: read lock file and infer most appropriate from there; low priority because
-    ## after bootstrapping packrat a restore should do the right thing
-    if (length(packratSrcPath) > 1) {
-      warning("Multiple versions of packrat available in the source directory;",
-              "using packrat source:\n- ", shQuote(packratSrcPath))
-      packratSrcPath <- packratSrcPath[[1]]
-    }
-
-
-    lib <- file.path("packrat", "lib", R.version$platform, getRversion())
-    if (!file.exists(lib)) {
-      dir.create(lib, recursive = TRUE)
-    }
-    lib <- normalizePath(lib, winslash = "/")
-
-    message("> Installing packrat into project private library:")
-    message("- ", shQuote(lib))
-
-    surround <- function(x, with) {
-      if (!length(x)) return(character())
-      paste0(with, x, with)
-    }
-
-    ## The following is performed because a regular install.packages call can fail
-    peq <- function(x, y) paste(x, y, sep = " = ")
-    installArgs <- c(
-      peq("pkgs", surround(packratSrcPath, with = "'")),
-      peq("lib", surround(lib, with = "'")),
-      peq("repos", "NULL"),
-      peq("type", surround("source", with = "'"))
-    )
-    installCmd <- paste(sep = "",
-                        "utils::install.packages(",
-                        paste(installArgs, collapse = ", "),
-                        ")")
-
-    fullCmd <- paste(
-      surround(file.path(R.home("bin"), "R"), with = "\""),
-      "--vanilla",
-      "--slave",
-      "-e",
-      surround(installCmd, with = "\"")
-    )
-    system(fullCmd)
-
-    ## Tag the installed packrat so we know it's managed by packrat
-    ## TODO: should this be taking information from the lockfile? this is a bit awkward
-    ## because we're taking an un-annotated packrat source tarball and simply assuming it's now
-    ## an 'installed from source' version
-
-    ## -- InstallAgent -- ##
-    installAgent <- 'InstallAgent: packrat 0.4.7-1'
-
-    ## -- InstallSource -- ##
-    installSource <- 'InstallSource: source'
-
-    packratDescPath <- file.path(lib, "packrat", "DESCRIPTION")
-    DESCRIPTION <- readLines(packratDescPath)
-    DESCRIPTION <- c(DESCRIPTION, installAgent, installSource)
-    cat(DESCRIPTION, file = packratDescPath, sep = "\n")
-
-    # Otherwise, continue on as normal
-    message("> Attaching packrat")
-    library("packrat", character.only = TRUE, lib.loc = lib)
-
-    message("> Restoring library")
-    restore(restart = FALSE)
-
-    # If the environment allows us to restart, do so with a call to restore
-    restart <- getOption("restart")
-    if (!is.null(restart)) {
-      message("> Packrat bootstrap successfully completed. ",
-              "Restarting R and entering packrat mode...")
-      return(restart())
-    }
-
-    # Callers (source-erers) can define this hidden variable to make sure we don't enter packrat mode
-    # Primarily useful for testing
-    if (!exists(".__DONT_ENTER_PACKRAT_MODE__.") && interactive()) {
-      message("> Packrat bootstrap successfully completed. Entering packrat mode...")
-      packrat::on()
-    }
-
-    Sys.unsetenv("RSTUDIO_PACKRAT_BOOTSTRAP")
-
-  }
-
-})
diff --git a/packrat/packrat.lock b/packrat/packrat.lock
deleted file mode 100644
index 5364b99..0000000
--- a/packrat/packrat.lock
+++ /dev/null
@@ -1,437 +0,0 @@
-PackratFormat: 1.4
-PackratVersion: 0.4.7.1
-RVersion: 3.3.1
-Repos: CRAN=https://cran.rstudio.com/,
-    CRANextra=http://www.stats.ox.ac.uk/pub/RWin
-
-Package: BH
-Source: CRAN
-Version: 1.60.0-2
-Hash: be2967bcff307e561d9ba17faf03205c
-
-Package: DBI
-Source: CRAN
-Version: 0.5-1
-Hash: 375869004db963f9915f2b8a49b4a718
-
-Package: DEoptimR
-Source: CRAN
-Version: 1.0-6
-Hash: 0d74e13bdb47749dc511cee60e1a167e
-
-Package: R6
-Source: CRAN
-Version: 2.1.3
-Hash: 1a8313c9df76d2a06aa27c13a4a71c73
-
-Package: RColorBrewer
-Source: CRAN
-Version: 1.1-2
-Hash: c0d56cd15034f395874c870141870c25
-
-Package: Rcpp
-Source: CRAN
-Version: 0.12.7
-Hash: f0ba7322cfb66f1b563462faa9c2b2ab
-
-Package: TSP
-Source: CRAN
-Version: 1.1-4
-Hash: d9362c64bfa5880eafd9050fe7cda5c4
-Requires: foreach
-
-Package: assertthat
-Source: CRAN
-Version: 0.1
-Hash: 0afb92b59b02593c70ff8046700ba9d3
-
-Package: badgecreatr
-Source: CRAN
-Version: 0.1.0
-Hash: 5f0441ad49972a36c301a5ad4a4b3993
-Requires: stringr
-
-Package: base64enc
-Source: CRAN
-Version: 0.1-3
-Hash: c590d29e555926af053055e23ee79efb
-
-Package: bitops
-Source: CRAN
-Version: 1.0-6
-Hash: 67d0775189fd0041d95abca618c5c07e
-
-Package: brew
-Source: CRAN
-Version: 1.0-6
-Hash: 931f9972deae0f205e1c78a51f33149b
-
-Package: caTools
-Source: CRAN
-Version: 1.17.1
-Hash: 97cb6f6293cd18d17df77a6383cc6763
-Requires: bitops
-
-Package: colorspace
-Source: CRAN
-Version: 1.2-6
-Hash: 00bb12245cd975c450cc4a960884fa15
-
-Package: crayon
-Source: CRAN
-Version: 1.3.2
-Hash: 576a9d297a567d6a5ebd164ca5221590
-
-Package: curl
-Source: CRAN
-Version: 2.1
-Hash: e3d6a6a421b8418ae333894b6a16829f
-
-Package: dendextend
-Source: CRAN
-Version: 1.2.0
-Hash: fd858c4254ec5c9871a28e902ab01fa2
-Requires: fpc, ggplot2, magrittr, whisker
-
-Package: devtools
-Source: CRAN
-Version: 1.12.0
-Hash: bbad95109ae75cbb14099281cda43af2
-Requires: digest, git2r, httr, jsonlite, memoise, rstudioapi, whisker,
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-
-Package: dichromat
-Source: CRAN
-Version: 2.0-0
-Hash: 08eed0c80510af29bb15f840ccfe37ce
-
-Package: digest
-Source: CRAN
-Version: 0.6.10
-Hash: 87165608ca8aeb0958835c3c5b52b6b7
-
-Package: diptest
-Source: CRAN
-Version: 0.75-7
-Hash: de93e5330ff45c5795d0bae12c8a9695
-
-Package: dplyr
-Source: CRAN
-Version: 0.5.0
-Hash: 03e5e71801c0f49217922e2cd4680f06
-Requires: BH, DBI, R6, Rcpp, assertthat, lazyeval, magrittr, tibble
-
-Package: evaluate
-Source: CRAN
-Version: 0.9
-Hash: cf338d73ba4ee3a4fefec612cdfd38db
-Requires: stringr
-
-Package: flexmix
-Source: CRAN
-Version: 2.3-13
-Hash: 4c5ae92368e1cc01c26afd1e67b66cd3
-Requires: modeltools
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-Source: CRAN
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-Source: CRAN
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-Package: fpc
-Source: CRAN
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-Hash: e537c1c8a52f67db5296c272e9090cbc
-Requires: diptest, flexmix, kernlab, mclust, mvtnorm, prabclus,
-    robustbase, trimcluster
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-Package: gclus
-Source: CRAN
-Version: 1.3.1
-Hash: d6047d34e2f634d2163405db9a3f7774
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-Package: gdata
-Source: CRAN
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-Package: ggplot2
-Source: CRAN
-Version: 2.2.0
-Hash: 78c14285e0c114542d051a09bd552472
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-
-Package: ggrepel
-Source: CRAN
-Version: 0.6.3
-Hash: df268483bd8efae71ce0031b5a42603c
-Requires: Rcpp, ggplot2, scales
-
-Package: git2r
-Source: CRAN
-Version: 0.15.0
-Hash: 92d5a9f3cba5e146b92a76dabbc29fbb
-
-Package: gplots
-Source: CRAN
-Version: 3.0.1
-Hash: b7abe122479c203aa236499b7fc4b816
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-
-Package: gtable
-Source: CRAN
-Version: 0.2.0
-Hash: cd78381a9d3fea966ac39bd0daaf5554
-
-Package: gtools
-Source: CRAN
-Version: 3.5.0
-Hash: 471b2e2452dfb30fdc1dd6f1b567925a
-
-Package: highr
-Source: CRAN
-Version: 0.6
-Hash: aa3d5b7912b5fed4b546ed5cd2a1760b
-
-Package: htmltools
-Source: CRAN
-Version: 0.3.5
-Hash: a96dc1cfe628e66337c86be732567df2
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-Package: httr
-Source: CRAN
-Version: 1.2.1
-Hash: 7de1f8f760441881804af7c1ff324340
-Requires: R6, curl, jsonlite, mime, openssl
-
-Package: iterators
-Source: CRAN
-Version: 1.0.8
-Hash: 488b93c2a4166db0d15f1e8d882cb1d4
-
-Package: jsonlite
-Source: CRAN
-Version: 1.1
-Hash: 86d4b85b84421a4815f1bb4872e30ef4
-
-Package: kernlab
-Source: CRAN
-Version: 0.9-24
-Hash: 37726d9307b8183493bb9187ea0cde8c
-
-Package: knitr
-Source: CRAN
-Version: 1.14
-Hash: e7b411f5a5512295a260a45683fa0c4a
-Requires: digest, evaluate, formatR, highr, markdown, stringr, yaml
-
-Package: labeling
-Source: CRAN
-Version: 0.3
-Hash: ecf589b42cd284b03a4beb9665482d3e
-
-Package: lazyeval
-Source: CRAN
-Version: 0.2.0
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-Package: magrittr
-Source: CRAN
-Version: 1.5
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-Package: markdown
-Source: CRAN
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-Package: mclust
-Source: CRAN
-Version: 5.2
-Hash: 77406ad6a64bb972a5e05b658161261d
-
-Package: memoise
-Source: CRAN
-Version: 1.0.0
-Hash: 56e7087c3559eb7ba72a9afb349bf896
-Requires: digest
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-Package: mime
-Source: CRAN
-Version: 0.5
-Hash: 463550cf44fb6f0a2359368f42eebe62
-
-Package: modeltools
-Source: CRAN
-Version: 0.2-21
-Hash: 3dc03397b2a4375c8a5e5f09c8cf0ae1
-
-Package: munsell
-Source: CRAN
-Version: 0.4.3
-Hash: f96d896947fcaf9b6d0074002e9f4f9d
-Requires: colorspace
-
-Package: mvtnorm
-Source: CRAN
-Version: 1.0-5
-Hash: 55a3581188e15f13f5ba19c18e151ac2
-
-Package: openssl
-Source: CRAN
-Version: 0.9.4
-Hash: 5ceb5d83bba44e8e5a764ac6ad32e9fb
-
-Package: packrat
-Source: CRAN
-Version: 0.4.7-1
-Hash: 16ca16d36eb18d1d16113606ecc5c400
-
-Package: plyr
-Source: CRAN
-Version: 1.8.4
-Hash: 75ca080b10a9314a9b293964331e5df7
-Requires: Rcpp
-
-Package: prabclus
-Source: CRAN
-Version: 2.2-6
-Hash: e646245afbb6b8ed25e22e8a76b781cd
-Requires: mclust
-
-Package: praise
-Source: CRAN
-Version: 1.0.0
-Hash: 77da8f1df873a4b91e5c4a68fe2fb1b6
-
-Package: purrr
-Source: CRAN
-Version: 0.2.2
-Hash: 14bc8b3a4c61f67866ebfb413f77ff9f
-Requires: BH, Rcpp, dplyr, lazyeval, magrittr
-
-Package: qap
-Source: CRAN
-Version: 0.1-0
-Hash: c15a4e38f99efb0c7199d36617480431
-
-Package: registry
-Source: CRAN
-Version: 0.3
-Hash: f9447c26b51b8c96f53720c5ff862c93
-
-Package: reshape2
-Source: CRAN
-Version: 1.4.1
-Hash: c9a8d2349fe969cf519dd0ced9cc1414
-Requires: Rcpp, plyr, stringr
-
-Package: rmarkdown
-Source: github
-Version: 1.0.9014
-Hash: 7701c44c82bf23e5bba1e9dff4ac1982
-Requires: base64enc, caTools, evaluate, htmltools, jsonlite, knitr,
-    tibble, yaml
-GithubRepo: rmarkdown
-GithubUsername: rstudio
-GithubRef: master
-GithubSha1: 81c209271e06266115e08263dbcde5d007e4d77c
-
-Package: robustbase
-Source: CRAN
-Version: 0.92-6
-Hash: 2819fff51bd1e827b611126fc0227d46
-Requires: DEoptimR
-
-Package: roxygen2
-Source: CRAN
-Version: 5.0.1
-Hash: 77e2e933d3709300a251c7ef9cef82fc
-Requires: Rcpp, brew, digest, stringi, stringr
-
-Package: rstudioapi
-Source: CRAN
-Version: 0.6
-Hash: fd256f8bfb9a64cc35f98b0decb1a79f
-
-Package: rversions
-Source: CRAN
-Version: 1.0.3
-Hash: 44837671df6bf1d0b863dc6f83f42a16
-Requires: curl, xml2
-
-Package: scales
-Source: CRAN
-Version: 0.4.1
-Hash: c0b89e928595f6133fe9d5dc139060b0
-Requires: RColorBrewer, Rcpp, dichromat, labeling, munsell, plyr
-
-Package: seriation
-Source: CRAN
-Version: 1.2-0
-Hash: 9b6894e8a71289c03e7565d52402e5c9
-Requires: TSP, colorspace, dendextend, gclus, gplots, qap, registry
-
-Package: stringi
-Source: CRAN
-Version: 1.1.2
-Hash: 1ad6b1cc11d982ac233bf2fa2f7c9684
-
-Package: stringr
-Source: CRAN
-Version: 1.1.0
-Hash: 4d21d0063b37a17ea18eaec6acd29bf3
-Requires: magrittr, stringi
-
-Package: testthat
-Source: CRAN
-Version: 1.0.2
-Hash: 88d5291104227f9dc2e7c7c1d0eb6c74
-Requires: R6, crayon, digest, magrittr, praise
-
-Package: tibble
-Source: CRAN
-Version: 1.2
-Hash: 3b35b556ef7acddb0d28fe6a27ad50e4
-Requires: Rcpp, assertthat, lazyeval
-
-Package: tidyr
-Source: CRAN
-Version: 0.6.0
-Hash: daf06bb30f2d9581e69609e0c0f7d38a
-Requires: Rcpp, dplyr, lazyeval, magrittr, stringi, tibble
-
-Package: trimcluster
-Source: CRAN
-Version: 0.1-2
-Hash: 662a899a1377c7d3f2cef1722e335aff
-
-Package: whisker
-Source: CRAN
-Version: 0.3-2
-Hash: 803d662762e532705c2c066a82d066e7
-
-Package: withr
-Source: CRAN
-Version: 1.0.2
-Hash: 774eb7be9087cdc24b53b74e5359cfac
-
-Package: xml2
-Source: CRAN
-Version: 1.0.0
-Hash: a55c497b694e044296830eb8ac5c2fee
-Requires: BH, Rcpp
-
-Package: yaml
-Source: CRAN
-Version: 2.1.13
-Hash: 4854ccabebc225e8a7309fb4a74980de
diff --git a/packrat/packrat.opts b/packrat/packrat.opts
deleted file mode 100644
index 502a18f..0000000
--- a/packrat/packrat.opts
+++ /dev/null
@@ -1,11 +0,0 @@
-auto.snapshot: TRUE
-use.cache: FALSE
-print.banner.on.startup: auto
-vcs.ignore.lib: TRUE
-vcs.ignore.src: FALSE
-external.packages: 
-local.repos: 
-load.external.packages.on.startup: TRUE
-ignored.packages: 
-quiet.package.installation: TRUE
-snapshot.recommended.packages: FALSE
diff --git a/packrat/src/BH/BH_1.60.0-2.tar.gz b/packrat/src/BH/BH_1.60.0-2.tar.gz
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diff --git a/revdep/README.md b/revdep/README.md
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--- /dev/null
+++ b/revdep/README.md
@@ -0,0 +1,44 @@
+# Setup
+
+## Platform
+
+|setting  |value                        |
+|:--------|:----------------------------|
+|version  |R version 3.5.0 (2018-04-23) |
+|system   |x86_64, mingw32              |
+|ui       |RStudio (1.2.658)            |
+|language |(EN)                         |
+|collate  |English_United States.1252   |
+|tz       |America/Chicago              |
+|date     |2018-06-28                   |
+
+## Packages
+
+|package   |*  |version |date       |source                      |
+|:---------|:--|:-------|:----------|:---------------------------|
+|corrr     |*  |0.3.0   |2018-06-28 |local (edgararuiz/corrr@NA) |
+|covr      |   |3.1.0   |2018-05-18 |CRAN (R 3.5.0)              |
+|DBI       |   |1.0.0   |2018-05-02 |CRAN (R 3.5.0)              |
+|dbplyr    |   |1.2.1   |2018-02-19 |CRAN (R 3.5.0)              |
+|dplyr     |   |0.7.5   |2018-05-19 |CRAN (R 3.5.0)              |
+|ggplot2   |   |2.2.1   |2016-12-30 |CRAN (R 3.5.0)              |
+|ggrepel   |   |0.8.0   |2018-05-09 |CRAN (R 3.5.0)              |
+|knitr     |   |1.20    |2018-02-20 |CRAN (R 3.5.0)              |
+|lazyeval  |   |0.2.1   |2017-10-29 |CRAN (R 3.5.0)              |
+|magrittr  |   |1.5     |2014-11-22 |CRAN (R 3.5.0)              |
+|purrr     |   |0.2.5   |2018-05-29 |CRAN (R 3.5.0)              |
+|rlang     |   |0.2.1   |2018-05-30 |CRAN (R 3.5.0)              |
+|rmarkdown |   |1.10    |2018-06-11 |CRAN (R 3.5.0)              |
+|RSQLite   |   |2.1.1   |2018-05-06 |CRAN (R 3.5.0)              |
+|seriation |   |1.2-3   |2018-02-05 |CRAN (R 3.5.0)              |
+|testthat  |   |2.0.0   |2017-12-13 |CRAN (R 3.5.0)              |
+|tibble    |   |1.4.2   |2018-01-22 |CRAN (R 3.5.0)              |
+|tidyr     |   |0.8.1   |2018-05-18 |CRAN (R 3.5.0)              |
+
+# Check results
+
+0 packages
+
+
+
+
diff --git a/revdep/check.R b/revdep/check.R
new file mode 100644
index 0000000..2ea4dd9
--- /dev/null
+++ b/revdep/check.R
@@ -0,0 +1,5 @@
+library("devtools")
+
+revdep_check()
+revdep_check_save_summary()
+revdep_check_print_problems()
\ No newline at end of file
diff --git a/revdep/checks.rds b/revdep/checks.rds
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diff --git a/revdep/problems.md b/revdep/problems.md
new file mode 100644
index 0000000..14e3b58
--- /dev/null
+++ b/revdep/problems.md
@@ -0,0 +1,44 @@
+# Setup
+
+## Platform
+
+|setting  |value                        |
+|:--------|:----------------------------|
+|version  |R version 3.5.0 (2018-04-23) |
+|system   |x86_64, mingw32              |
+|ui       |RStudio (1.2.658)            |
+|language |(EN)                         |
+|collate  |English_United States.1252   |
+|tz       |America/Chicago              |
+|date     |2018-06-28                   |
+
+## Packages
+
+|package   |*  |version |date       |source                      |
+|:---------|:--|:-------|:----------|:---------------------------|
+|corrr     |*  |0.3.0   |2018-06-28 |local (edgararuiz/corrr@NA) |
+|covr      |   |3.1.0   |2018-05-18 |CRAN (R 3.5.0)              |
+|DBI       |   |1.0.0   |2018-05-02 |CRAN (R 3.5.0)              |
+|dbplyr    |   |1.2.1   |2018-02-19 |CRAN (R 3.5.0)              |
+|dplyr     |   |0.7.5   |2018-05-19 |CRAN (R 3.5.0)              |
+|ggplot2   |   |2.2.1   |2016-12-30 |CRAN (R 3.5.0)              |
+|ggrepel   |   |0.8.0   |2018-05-09 |CRAN (R 3.5.0)              |
+|knitr     |   |1.20    |2018-02-20 |CRAN (R 3.5.0)              |
+|lazyeval  |   |0.2.1   |2017-10-29 |CRAN (R 3.5.0)              |
+|magrittr  |   |1.5     |2014-11-22 |CRAN (R 3.5.0)              |
+|purrr     |   |0.2.5   |2018-05-29 |CRAN (R 3.5.0)              |
+|rlang     |   |0.2.1   |2018-05-30 |CRAN (R 3.5.0)              |
+|rmarkdown |   |1.10    |2018-06-11 |CRAN (R 3.5.0)              |
+|RSQLite   |   |2.1.1   |2018-05-06 |CRAN (R 3.5.0)              |
+|seriation |   |1.2-3   |2018-02-05 |CRAN (R 3.5.0)              |
+|testthat  |   |2.0.0   |2017-12-13 |CRAN (R 3.5.0)              |
+|tibble    |   |1.4.2   |2018-01-22 |CRAN (R 3.5.0)              |
+|tidyr     |   |0.8.1   |2018-05-18 |CRAN (R 3.5.0)              |
+
+# Check results
+
+0 packages with problems
+
+
+
+
diff --git a/revdep/timing.md b/revdep/timing.md
new file mode 100644
index 0000000..59483ca
--- /dev/null
+++ b/revdep/timing.md
@@ -0,0 +1,5 @@
+# Check times
+
+
+
+
diff --git a/tests/testthat.R b/tests/testthat.R
index 4e54c93..26a2471 100644
--- a/tests/testthat.R
+++ b/tests/testthat.R
@@ -1,4 +1,5 @@
 library(testthat)
 library(corrr)
+library(dplyr)
 
 test_check("corrr")
diff --git a/tools/readme/combination-1.png b/tools/readme/combination-1.png
new file mode 100644
index 0000000..7be3aa8
Binary files /dev/null and b/tools/readme/combination-1.png differ
diff --git a/tools/readme/combination-2.png b/tools/readme/combination-2.png
new file mode 100644
index 0000000..84993b9
Binary files /dev/null and b/tools/readme/combination-2.png differ
diff --git a/to-cor-df.png b/tools/readme/to-cor-df.png
similarity index 100%
rename from to-cor-df.png
rename to tools/readme/to-cor-df.png