Spectrum picker

It's a color picker that actually works:

![2014-09-27 04_02_21](https://cloud.githubusercontent.com/assets/108094/4430116/ac38b50e-461c-11e4-9744-544ab6196607.gif)

- Built in to codemirror palette addon
- Detects/preserves color format

Todo:
- [x] Restyle picker
- [ ] Modularize? I could take this whole thing: spectrum + the codemirror palette and turn it into a module. Guidance here would be nice.