make sensitive properties visible
Merge branch 'master' of github.com:oheidemann/extreme-play

* 'master' of github.com:oheidemann/extreme-play:
  fixed missing uid
  configuration option for unregistering. Moved expectation for client auth from payload to header.
finish unregister endpoint
Merge branch 'master' of github.com:oheidemann/extreme-play

* 'master' of github.com:oheidemann/extreme-play:
  Converting asserts to requirements