Updated code to reflect fact parameters that parameters that repeat
cannot be sent as a single parameter with comma seperated values
Added function to get a resource by URI to the Thing class
Updated Authority to be a subclass of Thing and updated test to use
findByURI function
Removed unnecessary use statements from AuthorityGeographic and
AuthorityTopical
Updated to get mocks for Person, Organization and Place
Added mocks for Person, Organization and Place
Added method for getting Organization resource by VIAF ID
Added function to get Person by VIAF ID
Added function to get Place by VIAF ID
Updated OfferTest to send heldBy parameter as array
Removed unnecessary namespace mappings
Added url mapping for Person, Organization and Place
Added tests for Person, Organization and Place
Commented out tests in ErrorTests which are failing due to incorrect
error messages
Moved tests of configuration to end of test set to make sure tests run
properly