Implements the visual style guide as a tab in the developer console

![screen shot 2014-10-27 at 3 30 02 pm](https://cloud.githubusercontent.com/assets/186715/4800696/d27fbe96-5e28-11e4-9030-6b834b299593.png)
@jdillon This is where the notification stuff lives. Uncomment this before you check it out.