Added changelist to site as history

Hey Guys,

I whipped this up for the request of a set of releases / release notes for jekyll.  Added a rake task to basically copy over the changelist directly into the site documentation and remove the old changelist that is there.

Here is what I believe I have left to do:

- [x] automagically add the formatting to the top of the changelist.md

If this is completely the wrong path let me know and I can either change this entirely or refactor it.