Re-add the generic_files stylesheet which was removed in #359

Before this change:
![screen shot 2014-04-10 at 2 13 15 pm](https://cloud.githubusercontent.com/assets/92044/2672255/7117453e-c0e4-11e3-96e2-2a197a1196d4.png)


After this change:
![screen shot 2014-04-10 at 2 13 28 pm](https://cloud.githubusercontent.com/assets/92044/2672257/77d266ba-c0e4-11e3-8fcc-4aeaae67b6f1.png)