Footer icons

- `.top-bar*` becomes `.brand-bar*` so the styles can be reused
- footer uses `.brand-bar`styles

![screen shot 2014-08-12 at 17 09 50](https://cloud.githubusercontent.com/assets/867233/3893475/1f3c0ef8-223b-11e4-8834-fe6d95fdf5c2.png)