CRATEIT-161: Adds new search provider interface
CRATEIT-161: Search queries now performed by search provider
CRATEIT-161: Simplifies search interface
Merge branch 'crateit-161b'

Conflicts:
	apps/crate_it/ajax/bagit_handler.php
	apps/crate_it/js/crate.js
	apps/crate_it/lib/bagit_manager.php
	apps/crate_it/templates/index.php