* go-go-gadget-webpack: (90 commits)
  add CHAGELOG.md entry for webpack branch
  fix failing rspec build
  fix test failure for merge request widget
  fix duplicate data-toggle attribute
  update rake tasks
  fix frontend tests
  remove sprockets-es6 and execjs dependencies
  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
  ...