public function addSet($handle, $name, $pkg = null, $locked = null)
 {
     $set = new SetEntity();
     $set->setAttributeKeyCategory($this->categoryEntity);
     $set->setAttributeSetHandle($handle);
     $set->setAttributeSetName($name);
     if ($pkg) {
         $set->setPackage($pkg);
     }
     if ($locked) {
         $set->setAttributeSetIsLocked($locked);
     }
     $this->entityManager->persist($set);
     $this->entityManager->flush();
     return $set;
 }