public function update(Entity $entity)
{
$group = $entity->getId();
$this->verifyGroup($group);
$config = \Kohana::$config->load($group);
$immutable = $entity->getImmutable();
foreach ($entity->getChanged() as $key => $val) {
if (!in_array($key, $immutable)) {
$config->set($key, $val);
}
}
}
