Revised header

Looks like this:
![screen shot 2013-06-20 at 5 54 46 pm](https://f.cloud.github.com/assets/108094/684264/1803861a-d9f4-11e2-8a0d-becb45d3e303.png)

I also removed completely the 'back' button. Instead, only can click on the big preset button to go back.

Todo:

- [ ] Add reference button
- [x] Add 'back' tooltip on hover
- [x] Properly update name when a new feature is selected

@jfirebaugh can you help me out with the two outstanding tasks?