* master: (33 commits)
  Improved code style on the issue_sidebar_spec.rb
  add CHAGELOG.md entry for !8831
  remove assets:compile step from relative_url docs
  update scripts and docs to reference the newly namespaced rake task
  namespace assets rake tasks to gitlab:assets:*
  correct gzip files if they exist as well
  automatically correct CSS urls on assets:precompile
  remove hard-coded assets path for ace editor modules
  Fixed cancel button in the services form not redirecting back to the integrations settings view
  Fix search bar search param encoding
  Fix a transient failure in the `Explore::ProjectsController` spec
  Fix filtering with multiple words
  Fix project name label's for reference in project settings
  Fixed merge request tabs extra margin
  Don't call `#uniq` on a relation
  Move Gitlab::Shell and Gitlab::ShellAdapter files to lib/
  Move ApplicationSetting DEFAULTS to `.defaults` instead
  Move a begin/rescue clause to ApplicationSetting.expire
  Use badge partial as single source of truth instead of having 2 partials doing the same
  Changes after review
  ...