fix #64 (add link to report bugs)

I added a styled footer with a link to this issue tracker. I tried to make the style fit in as best as possible with the theme while still keeping it readable. Let me know if there are any improvements I can make.

Running in FF 20:
![Screenshot from 2013-04-10 14:05:26](https://f.cloud.github.com/assets/1376599/363656/62450faa-a209-11e2-93b5-b142050b9fb7.png)