OR-579 add commnunityModule#removeMembershipRequest function
OR-579 add route and controller for DELETE /api/community/cid/membership/userid
OR-579 add doc for DELETE /api/community/cid/membership/userid
OR-579 add midway tests for DELETE /api/community/cid/membership/userid
OR-579 use communitiesController#transform to return filetered community object
OR-579 remove unused helper
OR-579 rephrase description for DELETE and PUT /api/communities/id/membership/userid
OR-579 return 204 instead of 200
Merge pull request #452 in OR/rse from OR/rse-gcrosmarie:OR-579-DELETE-/api/communities/id/membership/userid to master

* commit '60c5f61c86ca8c9659894afd3399ee99eaaa482d':
  OR-579 return 204 instead of 200
  OR-579 rephrase description for DELETE and PUT /api/communities/id/membership/userid
  OR-579 remove unused helper
  OR-579 use communitiesController#transform to return filetered community object
  OR-579 add midway tests for DELETE /api/community/cid/membership/userid
  OR-579 add doc for DELETE /api/community/cid/membership/userid
  OR-579 add route and controller for DELETE /api/community/cid/membership/userid
  OR-579 add commnunityModule#removeMembershipRequest function