Added endpoint for marking annotations as done
Added sentiment to Tags and SubTags, modified create/update tag/subtag endpoints, added set instance sentiment endpoint
Endpoint for adding Notes to annotations in AnnotationController
Endpoint for annotation instance deletion - untested
Minor fixes, added annotation instance endpoint - untested
Added GET /annotation for retrieving annotation state
Endpoint /user/annotations for user's annotations
Added endpoint to UserController
Added AnnotationController and Service
Documents can now be assigned to Users