This commit passes a room invite to the receive node, so you can react to it.
Sample invitation:
HDsvcHGiTYFxxxxxxx:mydomain.de : msg : Object
object
type: "r.invite"
payload: "Invitation"
userId: "@relay:mydomain.de"
topic: "!HDsvcHGiTYFxxxxxxx:mydomain.de"
_msgid: "ef1fd7f3c8ae82e6"
