adds sul styles in

Adds in initial sul styles for EarthWorks.

 - EarthWorks logo
 - Navbar header styles

![screen shot 2014-12-04 at 12 02 03 pm](https://cloud.githubusercontent.com/assets/1656824/5305111/755e0b94-7bad-11e4-9126-4ffb1118c5d0.png)