Updating the footer for edx.org and open edx.

Making the footer look more like the front page.

* Updated SASS for footer
* Updated HTML for open edx and edx.org templates
* Updated stubbed views
* Added !important SASS to overwrite some blanket LMS styles

Updating steve.m.sandbox.edx.org to have the latest changes.
@wedaly @andywaldrop @dianakhuang @griffresch 

What all changed in this file? It looks like most of the same content is still present but I'm having a hard time discerning if it was whitespace changes, wholesale moving of elements around, or actual additions/subtractions from the file.