* Add organization membership preview header
* Add API endpoints to preview a collaborators permission
* Add methods to preview a collaborators permission
* Add methods to the observable repo collaborator client
* Fix convention test failure
* Use correct API endpoint when using repository ID
* Move the helper function pair so they aren't in between another pair
* Use the correct URL for the review permission API endpoint
* Add unit tests
* Add integration tests for review permission methods
* Fix spelling mistake
* Renaming enum as per review
* Surface exceptions in RepoCollaboratorsClient.Add method
* Reintroducing try...catch but for NotFoundException
* Remove old/test dotnet core builds from appveyor
Update integration tests to ensure Permissions field is populated
Add Accept header for this functionality, so it works on GHE 2.5
Fix impacted URL unit tests
* updated xml documentation of Deployments method
* fixed in OrganizationMembersClient.Delete method.
* Revert "fixed in OrganizationMembersClient.Delete method."
This reverts commit f47405f5337e60945fdb3ccf1368f16069599217.
* fixed usage of "repos/{0}/{1}".FormatUri(owner, name);
* fixed usage of "user/keys/{0}".FormatUri(id)
* fixed usage of "users/{0}".FormatUri(login)
* added ApiUrls.StatsContributors method
fixed usage of "repos/{0}/{1}/stats/contributors".FormatUri(owner, repositoryName)
* added method ApiUrls.StatsCommitActivity
fixed usage of "repos/{0}/{1}/stats/commit_activity".FormatUri(owner, repositoryName)
* fix to prev. commit
* added method ApiUrls.StatsCodeFrequency
fixed usage of "repos/{0}/{1}/stats/code_frequency".FormatUri(owner, name)
* added method ApiUrls.StatsParticipation
fixed usage of "repos/{0}/{1}/stats/participation".FormatUri(owner, name)
* added method ApiUrls.StatsPunchCard
fixed usage of "repos/{0}/{1}/stats/punch_card".FormatUri(owner, name)
fixed documentation
* added method ApiUrls.RepoCollaborator
fixed usage of "repos/{0}/{1}/collaborators/{2}".FormatUri(owner, repo, user)
* added method ApiUrls.OrganizationMember
fixed usage of"orgs/{0}/members/{1}".FormatUri(org, user)
* added method ApiUrls.Organization
fixed usage of "orgs/{0}".FormatUri(organizationName)
* Fixed inconsistency in ApiUrls.cs (#1287)
* Fix inconsistecy in parameters name that used in methods that use "repos/{0}/{1}" syntax.
* added XML documentation for PullRequestFiles method
* updated XML documentation of some methods in ApiUrls
* added needed XML doc tags
* fixed name of parameter
* fixed name of parameter
* undo prev. commit
* updated XML documentation of ApiUrls
* fixed after merge errors
* fxied after merge errors
* added OrganizationMembersClient accidentaly missed during rebase
* errors fixed arises during merging
* fixed by remarks
