add inlet

Color picker appears when clicking hex or HSL color values:
![2014-08-11 11_31_18](https://cloud.githubusercontent.com/assets/108094/3880641/b669227c-2185-11e4-8565-f8e83dfd2091.gif)

This works pretty well across browsers. 

Two annoying bits: 
- On click, picker can only be dismissed by clicking off the picker. This is slightly annoying.
- No longer possible to double click hex color strings to select them.

@ian29 @karenzshea @amyleew you guys should give this branch a spin and let me know how much this improves your experience. I'm on the fence about it.