Merge remote-tracking branch 'upstream/master' into gem/sm/bump-google-api-client-gem-from-0-8-6-to-0-13-6

* upstream/master: (186 commits)
  Resolve "Precompiled assets with digest strings are ignored in CI"
  Fix navigation dropdown close animation on mobile screens
  Add (partial) index on Labels.template
  Add grpc.log for Gitaly
  Fix gitaly-proto version in Gemfile.lock
  refactor issues_controller_spec `update` action
  Remove edit action for issues
  Add documentation to summarise project archiving
  Fix for Gitaly nil encoding issue
  Fix broken certificate-authority-data with kubectl >= 1.8.0
  Improve performance of filtering notes in NotesController
  Bump gitaly-proto version to v0.39.0
  Fix specs for project creation and update services
  Add CHANGELOG
  Doesn't check if path exists on disk when renaming a hashed project
  [ci skip] Fix archive spec descrptions
  Only copy old/new code when selecting left/right side of parallel diff
  Fix gitlab-rake gitlab:import:repos task
  Send extra Gitaly params for `send_git_archive` if needed
  Update GitLab Pages to v0.6.0
  ...