Upgrade Bootstrap, modernize markup

Updates Twitter Bootstrap to version 3.2 and utilizes new `list-group` styles for `top-list` components.

![screen shot 2014-10-11 at 11 12 54 pm](https://cloud.githubusercontent.com/assets/109822/4605271/5fcb22bc-51d7-11e4-98fb-93848ae85715.png)

Builds on #7. [Screenshot](https://cloud.githubusercontent.com/assets/109822/4605275/7181030a-51d7-11e4-9b03-30db98cefc55.png) of full page.