SOLR-4316: Added a simple collections dropdown menu
SOLR-4316: Prefix core specific url paths to ~core/core_name/ and show core specific options only in cloud mode
SOLR-4316: Generates collection menu correctly and Analysis works under collection mode
SOLR-4316: Query works in both core and collection mode
SOLR-4316: Schema browser now works in both core and collection mode
SOLR-4316: Documents view now works in both core and collection mode
SOLR-4316: Configuration view now works in both core and collection mode
SOLR-4316: Move dataimport back into core specific views
SOLR-4316: Run sammy after collections are loaded
SOLR-4316: Only one of collection or core menu should be open and visible
SOLR-4316: First cut of the collection dashboard