Merge branch 'release/0.4.0'

* release/0.4.0: (149 commits)
  buddycloud-server 0.4.0
  Add systemd service file
  Atoms are only in /posts and /status
  Avoid sync in test suite
  Workaround async weirdness
  Add @denisw to contributors
  Upgrade required node version to 0.8
  Use local CoffeeScript "cake" for "npm install"
  updates sent via email from vorner.cz
  updates sent via email from vorner.cz
  We actually need remote subscriptions nodes
  Reject remote posts with invalid dates
  Add tests for remote posts with invalid dates
  Force anon subscriptions to be temporary
  Set default affiliation to 'none' for anon users
  Cleanup: remove some dead code
  Purge remote nodes with no local subscription left
  Sort recent items by update time
  Fix tests that push remote items
  Validate remote items
  ...

Conflicts:
	package.json