message: don't let 3pid invites mark room as unread
  fixes
diff: @@ -28,6 +28,8 @@ module.exports = {
  return false;
  } else if (ev.getType() == 'm.room.member') {
  return false;
  + } else if (ev.getType() == 'm.room.third_party_invite') {
  + return false;
  } else if (ev.getType() == 'm.call.answer' || ev.getType() == 'm.call.hangup') {
  return false;
  } else if (ev.getType == 'm.room.message' && ev.getContent().msgtype == 'm.notify') {
  