v0.5.1

Fixed

• The default data.tag no longer reaches outputs that cannot read it. 0.5.0
  wrote it onto every output of every person, and adapters that validate their
  data refused the call outright: since 0.5.0, somebody whose output was a
  notify.airplay_* or notify.satellite_* service received nothing at all.
  The default tag now goes to phone (mobile_app) outputs and to
  notify.persistent_notification only.
• A tag you set yourself is your own key and still reaches every output.