GH Pages design cleanup

Removes a lot of the gradients, images, etc, and moves to a lighter color scheme. Also adds transitions to the bar :sparkles:

Current state:

![screen shot 2014-09-13 at 21 43 10](https://cloud.githubusercontent.com/assets/211284/4261784/38bd092a-3b7e-11e4-9900-c5fe8e3347a4.png)