Added signed sponsors to sponsor section

Haven't received texts from Chas and Wunderkraut yet. Also, I'm not 100% sure about the sponsorship levels. 

![screenshot 2013-11-06 20 01 54](https://f.cloud.github.com/assets/165154/1485524/6d2e884e-4716-11e3-8767-ed1ed5b179e0.png)