Adds SU and SUL Footer and modifies layout to enable vis design

Fixes #360 
Fixes #147 
Starts on #366 

Page layout not complete but starts starts on it to build out footer. Sets a pattern for SASS variables and mixins [PROPOSED].

![screen shot 2014-06-27 at 6 05 54 pm](https://cloud.githubusercontent.com/assets/1656824/3419376/e43762ce-fe60-11e3-8f05-e8d8b05a8581.png)

![screen shot 2014-06-27 at 6 05 47 pm](https://cloud.githubusercontent.com/assets/1656824/3419377/eb2c91f8-fe60-11e3-8a29-2971812e684c.png)

Is there any particular reason why we're closing these divs in this partial as opposed to the layout file they're opened in? May get a bit confusing when trying to make changes to the layout.