docs: function(namespacedEvent, callback) {
        var event, namespace, _ref;
        _ref = namespacedEvent.split("."), event = _ref[0], namespace = _ref[1];
        if (namespace) {
          callback.__PIXIE || (callback.__PIXIE = {});
          callback.__PIXIE[namespace] = true;
        }
        eventCallbacks[event] || (eventCallbacks[event] = []);
        eventCallbacks[event].push(callback);
        return this;
      }