Fix the Rakefile to not use random fuckery

[andrewjkerr]

Holy crap. Why is the Rakefile so... weird?

Anyway, the current deploy process is this:

1. Remove all files from _deploy (minus the .git folder)
2. Copy generated files from jekyll build from public to _deploy
3. cd _deploy && git add . && git commit -m {message} && git push

This seems all fine and dandy until you realize that _deploy needs to be it's own git repo. This means that the current setup process is to rm _deploy && git clone [ufsit.github.io repo] _deploy which is pretty silly in my opinion.

Following #3, the Rakefile should be updated to allow for an easier set up. #3 might solve this issue, but it might not. We'll see.