No sidebar

The sidebar obscures one's view when the browser window isn't wide enough:
![screen shot 2014-05-30 at 5 20 53 pm](https://cloud.githubusercontent.com/assets/3216121/3136453/9af9d29c-e842-11e3-8663-2b60acd989f5.png)

It should just be taken out IMO, the page isn't too long and the organization is very well done.

PR takes out the sidebar.