Removed broken link to footerbg image and removed unused image.

The link was bad so the footer image actually isn't used right now.

It looks like this if you were to fix the link, which I don't think is better than the current flat grey:
![image](https://cloud.githubusercontent.com/assets/1953083/3715365/df9a78a2-15dd-11e4-9b76-6b54f8747b91.png)