Orion-LD v1.2.1

Bug fixes for v1.2.0
#1368 - Fixed a bug in subscription patch regarding modification of cached fields 'description', 'q', and 'entities'
#1374 - similar to #1368
#280 - error handling in registration creation - making sure exclusive registrations specify mandatory fields entity-id and attributes
#280 - error handling in registration updates - making sure exclusive registrations specify mandatory fields entity-id and attributes