* feature/gb/migrate-pipeline-stages: (76 commits)
  redesign caching of application settings
  Fix binary encoding error on MR diffs
  Fix missing tooltip and ARIA labels for accessibility
  Add info on using self-signed certs with Registry
  Actually clean gitlab-test path when TestEnv.set_repo_refs fails
  Introduce optimistic locking support via optional parameter last_commit_id on File Update API
  Move issuable bulk edit form into a new sidebar.
  Add PowerShell to CI variable docs
  Responsive environment tables
  Accept a username for User-level Events API
  Introduce an Events API
  Update GitLab Pages to v0.4.3
  Allow numeric pages domain
  Remove references to old settings location
  Resolve "API: Environment info missed"
  Fix Projects API spec
  Resolve "When changing project visibility setting, change other dropdowns automatically"
  Update explanation of job-level variable override to fit example
  change headings to improve SEO
  backports changed import logic from pull mirroring feature into CE
  ...