Merge branch 'stable'

* stable:
  Support different color pallete when not signed in
  Send new patchset event after its available
  Enable git:// download URLs if canonicalGitUrl set
  Fix NPE on Gerrit startup if mail.from doesn't include a name
  Add config setting to only suggest users which are in a visible group

Change-Id: I2bc9ca40e616c7f7b0c12de41f631c916439289c