Various speed improvements for search, media, names, collection, and overview
Caching session users, and session partial; other performance improvements
Temporary bug fix for object version lookup
Testing some improvements around finding latest versions of objects; better collections performance
Merge branch 'master' into pleary_dev
Cleaning up and last bug fixes of performance improvements;
Merge branch 'master' into virtuoso

Conflicts:
	app/controllers/taxa/media_controller.rb
	app/models/taxon_concept.rb
	app/models/taxon_user_classification_filter.rb
	app/views/taxa/media/index.html.haml