message: Fix inviting multiple people to a room
  Removes the promise notify as bluebird doesn't support it. It's
  also not used anywhere now.
  Fixes
diff: @@ -36,10 +36,6 @@ export default class MultiInviter {
  * Invite users to this room. This may only be called once per
  * instance of the class.
  *
  - * The promise is given progress when each address completes, with an
  - * object argument with each completed address with value either
  - * 'invited' or 'error'.
  - *
  * @param {array} addresses Array of addresses to invite
  * @returns {Promise} Resolved when all invitations in the queue are complete
  */
  @@ -111,7 +107,6 @@ export default class MultiInviter {
  if (this._canceled) { return; }
  this.completionStates[addr] = 'invited';
  - this.deferred.notify(this.completionStates);
  this._inviteMore(nextIndex + 1);
  }, (err) => {
  