Moar sidebar stuff

Looks like this:

![screen shot 2014-08-25 at 4 26 20 pm](https://cloud.githubusercontent.com/assets/2289/4038152/b2c7cec2-2caf-11e4-97a4-00bf71ba4158.png)

hm... looks like maybe all the .styl files have 4-spaced tab-tabs? Let's make a separate commit that fixes that to 2-spaced space-tabs.