Add 'tdil' to display options list

Also moves specs for 'displays' and 'to_solr' to tufts_base_spec
added tdil to list of displays
added solr index that tufts-image-library needs
added test for index change on displays
removed explicit namespaces to be consistent with tufts_models change
working on upgrading to hydra 7 and blacklight 5
got gallery view showing
got stored_collection_id working again

finshed fixing tests for blacklight upgrade
Fixed navbar style for bootstrap 3.  Story #273
Fixed style on advanced search page, catalog sidebar, and footer. Story #273
Moved content down so it won't be obscured by header.  Story #273
Ordered collection datastream for story #250
added collections create, list view, and drag and drop on search results
Disable TIL specific stuff for MIRA. Closes #272
Test with TIL and MIRA
Don't require unnecessary gems on Travis
Add a TIL header
Prefix datastreams to avoid deprecation warnings
Don't run purge or revert tests for TIL
add datastream prefix to avoid deprecation warning