Favicon and some styles

At long last, added the favicon as well as a logo to the main page.

![with logo](https://cloud.githubusercontent.com/assets/5129775/5134838/5c5d6f08-70d7-11e4-94cc-8e030b3770ee.png)

This is the SVG logo generated by illustrator. I figured I shouldn't mess with it. :camel: