Image optimization

Hello! I've run the repo through [ImageOptim](http://imageoptim.com), which crunches the metadata fat out of images without compromising any of the image quality.

You're dealing with incredible traffic lately, and while this won't _solve_ problems, it'll at least speed things up a little. Image attached of total savings (47.5%, or removed 16.8MB of the 35.4MB in the repo.)

![Screen Shot 2013-03-16 at 10 45 25 AM](https://f.cloud.github.com/assets/107362/267104/8ebcab50-8e5a-11e2-97f6-9ac89aaa631d.png)