* master: (96 commits)
  Fetch the merged branches at once
  Merging EE doc into CE
  Avoid using Rugged in Gitlab::Git::Wiki#preview_slug
  Cache commits on the repository model
  Remove groups_select from global namespace & simplifies the code
  Change default disabled merge request widget message to "Merge is not allowed yet"
  Semi-linear history merge is now available in CE.
  Remove repetitive karma spec
  Improve spec to check hidden component
  Rename to shouldShowUsername
  Add KubernetesService#default_namespace tests
  Revert "Merge branch '36670-remove-edit-form' into 'master'"
  Fix bitbucket login
  Remove duped tests
  Add path attribute to WikiFile class
  Make local_branches OPT_OUT
  Clarify the language around External Group membership with SAML SSO to clarify that this will NOT add users to GitLab Groups.
  Added ssh fingerprint, gitlab ci and pages information in an instance configuration page
  Fix the incorrect value being used to set GL_USERNAME on hooks
  Resolve "Remove overzealous tooltips in projects page tabs"
  ...