Add Google Book data to search results (cover image) and record view (cover image and links)
Consolidate two online access panels to one
Rearrange cover image rendering (based on jkeck's idea)
Merge pull request #123 from sul-dlss/google-book-covers

Add Google Book covers and preview/info links to search results and record view
Adds mods metadata contributors empty panel
Fix for empty 'Available online' panel
Merge pull request #158 from sul-dlss/mods-contrib

Adds mods metadata contributors empty panel
Merge pull request #159 from sul-dlss/online-panel-fix

Fix for empty 'Available online' panel
sets up mods_display gem
mods display spec
adds support for image item show and index pages, with filling out of the mods views