OR-724 Augment DELETE community membership for community managers
OR-724 Fix error messages
OR-724 Flag community manager
Merge pull request #501 in OR/rse from OR/rse-chamerling:OR-724-augment-delete-membership to master

* commit 'f04a0ebf70281101b9e637adc797502dba4ee042':
  OR-724 Flag community manager
  OR-724 Fix error messages
  OR-724 Augment DELETE community membership for community managers
OR-724 Fix membership call
Merge pull request #503 in OR/rse from OR/rse-chamerling:OR-724-fix to master

* commit '16e079e91dcf393a970ac6f6a24432cdd8cf3c94':
  OR-724 Fix membership call
OR-724 Fix membership mocks
Merge pull request #504 in OR/rse from OR/rse-chamerling:OR-724-fix to master

* commit 'c2d3d7526c5803bc2adc6e2b7d04ad3d60d939ec':
  OR-724 Fix membership mocks