Adds jquery-minicolors to the theme values

Looks like this. It needs a bit of restyling to make it neater, @joecohens? I'm happy to merge this for now as it's working and usable.

![screenshot 2014-12-29 19 51 09](https://cloud.githubusercontent.com/assets/246103/5572290/113a4e5c-8f94-11e4-9bb4-b9a7a4b490d3.png)