[MIE-1633] Validate create activities only for the current user
[MIE-1633] Add DELETE validation and update tests
[MIE-1633] Updated delete endpoints on objectController with the correct status
[MIE-1633] Fixed tests
Merge pull request #52 from natgeo/feature/MIE-1633

[MIE-1633] Validate create activities only for the current user