A real working blog example! YAY!

This reads in a list of markdown files from a folder and converts them into blogposts in a DB. It also handles cleaning up any posts that don't have corresponding markdown files.

Markdown files should be placed in data/posts/, and named in YYYY-mm-dd-slug-for-title.md. They can have YAML frontmatter and markdown:

---
title: This is a sample post
published: 1
---

This is the content.

### And it supports markdown

I'm going to run this on the dev site for a bit. If anyone has any blog articles they want to write, they can branch off of this branch.

Fixes #22