Remove the special styling on the Categories link

![image](https://cloud.githubusercontent.com/assets/627891/3023159/b011dfec-dfde-11e3-97c4-1fe76315d385.png)


Old: 
![image](https://cloud.githubusercontent.com/assets/627891/3023162/c02c50d8-dfde-11e3-96b5-1f9c7cab171c.png)