Add Stanford and SUL headers and footers

[jvine]

Basic page layout should look like this:

The library website has the current official header and footer logos (as svg), as well as the footer links: http://library.stanford.edu/sites/all/themes/sulair2016/logo.svg http://library.stanford.edu/sites/all/themes/sulair2016/assets/images/sul-logo-stacked.svg

@jgreben the current HTML (that you sent me 5/2) is not quite right - the footer is not correctly pinned to the bottom of the viewport. I think the problem is here:

             </div>
           </div>
         </div>
       </div>

       <footer role="“contentinfo”">

which I think should be:

             </section>
           </div>
         </div>
       </div>

       <footer role="“contentinfo”">

because the

above is not closed, but there's an extra