UBItem:: changed get_all(limit, prop_array) to get_all(limit, id_only)
replaced all new static($elgg_object->guid) with new static($elgg_object->guid, $elgg_object) so that the constructor does not load the elgg_object again (the same with elgg_user)
optimized PerformanceRating methods replacing new static with get_properties where possible
updated REST API (removed comment manipulation methods from common_resource_functions