* master: (3075 commits)
  Fix rubocop spec.
  Implement final review comments from @rymai.
  Use `Gitlab::Access` to protected branch access levels.
  Fix `git_push_service_spec`
  Authorize user before creating/updating a protected branch.
  Have the `branches` API work with the new protected branches data model.
  Implement review comments from @axil.
  Remove duplicate specs from `git_access_spec`
  Implement review comments from @dbalexandre.
  Favor labels like `Allowed to push` over `Allowed To Push`.
  Add changelog entry.
  Admins count as masters too.
  Make specs compatible with PhantomJS versions < 2.
  Humanize protected branches' access levels at one location.
  Fix all specs related to changes in !5081.
  Fix default branch protection.
  Update protected branches spec to work with the `select`s.
  Allow setting "Allowed To Push/Merge" while creating a protected branch.
  Enforce "No One Can Push" during git operations.
  Add "No One Can Push" to the protected branches UI.
  ...

Conflicts:
	app/services/system_note_service.rb