Search appearance

This builds on the work @blisteringherb did on getting an image add to each search result and updating the appearance for the main search page. I made some style tweaks based on the mocks and refactored it a little to use the new neue theme functions @aaronschachter and I worked on. 

cc: @DFurnes @weerd @barryclark 
Might be cleaner to use [path_to_theme](https://api.drupal.org/api/drupal/includes%21theme.inc/function/path_to_theme/7) here.  Or additionally, set the default image within the preprocess as the `$content['image']`