New API wrapper initial
Unused file dpla.rb deleted, test code removed, require_dependency for 'dpla/search'
lib/dpla moved to lib/dpla2
Revised API wrapper interface
Implementation in progress
New API wrapper coming soon
Separated class for facets
classes rearranged
small facets fix
Permitted params for search
Merge remote-tracking branch 'origin/experiments_wrapper' into experiments

Conflicts:
	lib/dpla/search.rb
New API wrapper integrated
Merge branch 'experiments' into develop

Conflicts:
	app/helpers/items_helper.rb
preserved_search_fields() moved from ApplicationHelper to SearchHelper