Display recent changes as modal on side with dismiss button

I made it so that only logged in users can view recent changes, and styled it as a modal thing on the side of the front page. This is just a concept, although it seems like a better solution than just sticking on the top or bottom of the page. The little x will slide up and remove the window.

![screen shot 2013-06-05 at 12 26 37 am](https://f.cloud.github.com/assets/644004/610330/7ba4e2c6-cdb1-11e2-8414-b76f64aa613c.png)