code: function () {
      var self = this;
  
      _.each(self._namedSubs, function (sub, id) {
        sub._deactivate();
      });
      self._namedSubs = {};
  
      _.each(self._universalSubs, function (sub) {
        sub._deactivate();
      });
      self._universalSubs = [];
    }
docs: tear down all subscriptions. Note that this does NOT send removed or nosub messages, since we assume the client is gone.