* Add `BranchProtectionRequiredPullRequestReviews` and `BranchProtectionRequiredPullRequestReviewsUpdate` models
* Add missing ctors and fix naming
Tests where updated to use the minimum nesseccary constructor
* Fix debugger display
* Update BranchProtection response model to include new dismissal restrictions fields and tidy up existing properties ctors and DebuggerDisplay
* Update BranchProtectionUpdate request model to include new dismissal restrictions fields/classes and tidy up existing properties and DebuggerDisplay
* Update BranchProtection tests to use new RequiredReviews and dismissal restrictions options
* Add specific client endpoints for GetReviewEnforcement UpdateReviewEnforcement and RemoveReviewEnforcement
* Add unit and integration tests for new client methods
* Implement Observable client methods and unit tests
* Add integration tests for Observable client
* Run CodeFormatter to fix up whitespace
* Clarify review dismissal restriction behaviour in code comments
* Add BranchProtection.EnforceAdmins object
* Add EnforceAdmin related methods to RepoBranch clients
* Add unit tests
* Add unit tests for Observable client
* Add integration tests for enforce admin methods
* Tweak integration test to ensure that they actually do something
The `CreateRepositoryWithProtectedBranch` helper method currently sets `EnforceAdmins` as true, so delete it before adding.
* add missing docs
* rename tests
* Add missing ctor
* Remove property that is no longer supported
https://developer.github.com/changes/2017-05-02-adoption-of-admin-enforced/
* Fix failing unit tests
Change team and user lists to specific classes derived from Collection<T> so we can offer better configuration of BranchProtectionPushRestriction via multiple ctors (teams only, users only, teams and users, etc)
Add another ctor to BranchProtectionPushRestrictions for the case where no teams/users are specified (ie admin only)
Change organization update tests to use this new ctor and assert we get empty lists rather than no push restrictions
