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 

@stephensanchez right now we set MKTG_URLS but have no overrides for MKTG_URL_LINK_MAP.  We should sit down at some point and figure out what the correct set of settings for this should be.