Added sentiment to Tags and SubTags, modified create/update tag/subtag endpoints, added set instance sentiment endpoint
Added option to hide category from annotators, changed endpoints and services
Minor fixes, added annotation instance endpoint - untested
Moved Enums to Models project
Added default value to Annotation.Note
Code cleanup
Password in user ignored for JSON serialization
Version V2 working with GUID
Version 1 working state of DB and EF with integer IDs