/**
* Returns extension configuration.
* @param array default unexpanded values.
* @return array
*/
public function getConfig(array $defaults = NULL)
{
$config = $this->compiler->getConfig();
$config = isset($config[$this->name]) ? $config[$this->name] : array();
unset($config['services'], $config['factories']);
return Config\Helpers::merge($config, $this->compiler->getContainerBuilder()->expand($defaults));
}