badges == awesome!

Currently only uses
- unknown (no jobs, or repo doesn't exist)
- passing
- failing


![screen shot 2013-07-13 at 5 38 46 pm](https://f.cloud.github.com/assets/112170/793541/665c8392-ec15-11e2-89ee-f0d30b33da3d.png)

fixes strider-cd/strider#95