Wrapped buttons on mobile
With the addition of Octicons, the filter buttons wrap on mobile.

![screen shot 2014-06-30 at 11 34 50 am](https://cloud.githubusercontent.com/assets/900407/3431614/190dcad0-006c-11e4-8e67-56e40bd8c41e.png)

There's a media query that decreases the font size, but instead of decreasing it even more to accommodate Octicons, perhaps a dropdown should be used on mobile.
