Global and header design updates of awesome!

![screen shot 2014-12-19 at 11 54 08 am](https://cloud.githubusercontent.com/assets/2489247/5507947/d5cfe9d8-8775-11e4-93cb-8d59dfd7c093.png)

this should be wrapped with a `<div role="presentation">` so that screen readers don't interact with the SVG.