New homepage

We're holding off displaying things like Recently Updated, Most Depended Upon, Prolific Recently, etc because we want to fetch that stuff from the nascent relational registry.

Here's what it looks like currently:

![screen shot 2014-09-29 at 11 35 26 am](https://cloud.githubusercontent.com/assets/2289/4447034/8fdd2254-4807-11e4-8ba1-7f897a006508.png)