Behold, The Footer

Footer gives us a place to put content that 
doesn't fit in our "About" navigation scheme.

* Add a sticky footer
* Move the OSS/GitHub link to the footer
* Add back email contact link
Adjust header border
site styles -> page styles to match layout
rel: "external" for GitHub link
Merge pull request #9 from probablywrong/footsies

Footsies