Apps design

Created a new visual style for the apps page. Spaced things out a bit, and added some imagery for visual cues. The light font-weight made text a bit hard to read on platforms with less than stellar font rendering (Window), so I also added more font weights to aid readability.

Hopefully you like it!

![apps](https://cloud.githubusercontent.com/assets/561656/2870427/fe24dbce-d2c5-11e3-8fb2-f38851025e5b.png)