.functions: Tweak targz

Trim the trailing slash from the path argument passed to `targz`.

This fixes the annoying behavior where `targz foo/` created `foo/.tar.gz` instead of `foo.tar.gz`.

Ref. mathiasbynens#202.

.functions

@@ -28,7 +28,7 @@ function cdf() { # short for `cdfinder`
 
 # Create a .tar.gz archive, using `zopfli`, `pigz` or `gzip` for compression
 function targz() {
-	local tmpFile="${@}.tar"
+	local tmpFile="${@%/}.tar"
 	tar -cvf "${tmpFile}" --exclude=".DS_Store" "${@}" || return 1
 
 	size=$(