Record side-nav style tweaks.

Closes #860 

![sidenav](https://cloud.githubusercontent.com/assets/96776/4330118/6ec97bac-3fa7-11e4-94b6-8a55b4d1e919.png)
![sidenav-mobile](https://cloud.githubusercontent.com/assets/96776/4330119/6fe034cc-3fa7-11e4-84a3-6238fb5cff17.png)