public function add($name, TrailInterface $trail, $root = null)
{
$this->remove($name);
if (null !== $root) {
$root = $this->get($root);
$crumbs = array_merge($root->getCrumbs(), $trail->getCrumbs());
$trail->setCrumbs($crumbs);
}
$this->trails[$name] = $trail;
}
