Merge branch 'master' into refactor/ci-config-add-entry-error

* master: (345 commits)
  use rails root join
  fixed a couple of errors spotted in production
  Fix RangeError exceptions when referring to issues or merge requests outside of max database values
  Fix bug in `WikiLinkFilter`.
  Small frontend code fixes and restore 8a2d88f commit
  Warn about admin privilege to disable GitHub Webhooks
  Listing GH Webhooks doesn't stop import process for non GH admin users
  fixup! updated docs for api endpoint award emoji
  Update CHANGELOG
  Ensure Todos counters doesn't count Todos for projects pending delete
  Add endpoints for award emoji on notes
  Sort API endpoints and implement feedback
  Add endpoints for Award Emoji
  Fixed issue with assignee dropdown not selecting correctly
  Removed update method Re-structured controller spec Renamed issuable param to issuable_id
  Fix clibpoard buttons on "Check out branch" modal.
  Track method call times/counts as a single metric
  Cache todo counters (pending/done)
  Fix a 'wrong number of arguments' error
  Added missing mount point for Sidekiq Metrics API, after it got lost on rebase.
  ...