Made load_instance_from_solr ONLY use solr index.

This prevents hitting up Fedora to populate an object for the show/collection
views.
Compound object display from Solr.
More compound solr work.
Reduced solr calls for set index page.
Only query required sets.
Fix tests, add pending test for show view.
Merge pull request #646 from OregonDigital/feature/SpeedupCollectionIndex

Speed up collection/show views