* Register rooms and room-members
   http://xmpp.org/extensions/xep-0045.html#register

 * Room-defined nicknames and reserved/remembered nicknames
   http://xmpp.org/extensions/xep-0045.html#reservednick

 * Moderated rooms
   http://xmpp.org/extensions/xep-0045.html#requestvoice
   http://xmpp.org/extensions/xep-0045.html#voiceapprove

 * Administrated rooms
   - Ban users
   - Grant/revoke memberships
   - Grant moderator-previleges