code: function _gpfEventsIsValidHandler (eventHandler) {
      var type = typeof eventHandler,
          validator = _gpfEventsHandlerValidators[type];
      if (validator === undefined) {
          return false;
      }
      return validator(eventHandler);
  }
docs: Check if the provided parameter is a valid Event Handler
  
  @param {*} eventHandler Object to test
  @return {Boolean} True if the parameter is valid eventHandler