ENGINE-750: Operator endpoint
ENGINE-750: Fixes after code review
Merge branch 'master' into ENGINE-732
Merge branch 'master' into ENGINE-732
Login for operators; create method now returns activation code

EA-11
ENGINE-750

Implemented operators/login/evrythng. Fixed POST operators - now we generate an activation code and include it in response (inside status field). Moved OperatorStatus into public api.
Changed status update methods for operator

EA-11
ENGINE-750
Merge branch 'master' into ENGINE-732
Merge branch 'master' into ENGINE-732
Merge pull request #22 from evrythng/ENGINE-732

ENGINE-732: Separate Users and Operators