Bootstrap 3 -- Ready!

Major Changes:

- Bootstrap 3 with Yeti theme!
- Login form on home page
    - accounts/login is worthless at the moment

That's a lot of diffs :O

Every page should be properly styled right now.  If not, they're super easy to fix.  I've tested pretty much the whole site sans some of the competition pages and code repos.  
![screen shot 2014-01-31 at 3 28 55 pm](https://f.cloud.github.com/assets/5304384/2055021/c8fa063a-8abe-11e3-99b7-b639d0c0323a.png)