Registers an additional namespace.
string $name: The namespace component to register; e.g., 'node'.
string $path: The relative path to the Drupal component in the filesystem.
function drupal_classloader_register($name, $path) {
$loader = drupal_classloader();
$loader
->registerNamespace('Drupal\\' . $name, DRUPAL_ROOT . '/' . $path . '/lib');
}