Update sponsors page

A first shot at bringing it up to date. Needs a little illustration to pretty it up, but I think the text is pretty much there.

Random image used as an example, as opposed to something we should launch with (since it's Damon's photo).

![screen shot 2013-08-26 at 17 23 07](https://f.cloud.github.com/assets/736291/1027156/d4625222-0e6b-11e3-8e91-91e3e5ba2d87.png)