Clean up search results page based on DLTP-172

 * Add css specifically for search results and include it in the main
   curate.css.scss file.
 * Change labels and formatting of the search dropdown.
 * Remove "update" button and make search dropdowns auto submit
   onchange.
 * Change label and button text on the search facets in the blue box.
 * Remove duplicate faciting from yellow labels and move their "remove"
   functionality to the facets in blue.
 * Modify the pager to display as: previous, # of results, next.

dltp-172#

Remove some excess space from around the sort-and-per-page region.