For tiny media size, expand header to 12 columns.

Reported to @konklone, but he told me there was a repo for it so here I am.

Before and after:

![screen shot 2014-11-15 at 9 44 18 pm](https://cloud.githubusercontent.com/assets/237985/5060615/f583522c-6d14-11e4-8982-a905b50df80d.png)