Swatches

Add's swatches next to color values in codemirror:

![screen shot 2014-03-14 at 11 43 24 am](https://f.cloud.github.com/assets/61150/2425320/53eb4cda-abb3-11e3-9c1f-9fae9524ffd6.png)

cc @nickidlugash @samanpwbb