Changes for DLTP-187

Header changes:
 * Change "Hesburgh Library" and associated link to "Office of the
   Provost". This change was made in both the sufia.en.yml file and in
   the _brand_bar.html.erb file in order to get the correct text
   formatting.
 * Fix Login button on screensizes less than 768px

Footer changes:
 * Hesburgh Library logo and link to right side of footer.
 * Remove some text from the left side of the footer.
 * The build identifier is still in the html of the page, but is
   commented out so that it only appears in the source code.

Some additional changes to header and footer

Based on feedback from DBH:

 * Enlarge CurateND logo to  48px
 * Fix alignment of search and buttons to reflect changes to CurateND
   logo size change
 * Increase word spacing between "of" and "the"
 * Remove &copy symbol
 * Add and use full color mark for Hesburgh Libraries
 * Check vertical alignment of footer text and logo

Re-add beta bar. Change aboe comments to reflect that.
Merge pull request #122 from ndlib/dltp-187

Changes for DLTP-187