Merge branch 'master' into fix/visibility-level-setting-in-forked-projects

* master: (23 commits)
  Use single spaces
  Improvements to profile page UI
  Replace all usages of `git` command with configurable binary path
  Update Shell Commands doc for configurable git binary path
  Minor reformatting for Facebook integration doc
  Use proper labels for OAuth providers
  Add Facebook authentication
  Bump stamp to ~> 0.6.0
  Add extra padding between user description and links on profile page
  Fix tests
  Fix clipboard button overflow
  Apply new design for user profile page
  Improve profile page UI
  Better name for up-level links
  Fixed User sorting specs
  Only sort by IDs by default
  Added benchmark for User.all
  Add changelog entry for contacted_at
  Spread out runner contacted_at updates
  Only redirect to homepage url when its not the root url
  ...