code: function(other, evname, callback) {
      if (!this._listeningTo) return;
      if (!other) {
        for (var cid in this._listeningTo) {
          this.stopListening(this._listeningTo[cid], evname, callback);
        }
      } else {
        other.off(evname, callback, this);
        // TODO: remove local listener tracker
      }
    }
docs: Remove event listener from an other object
  
  @param {object} object to listening to
  @param {string} name of event
  @param {function} callback
  @return {this}