Merge branch '1.1.x' of github.com:doctrine/persistence into fix-metadata-caching-1-1-x

Author: dron-alterpost

lib/Doctrine/Common/Persistence/Mapping/AbstractClassMetadataFactory.php

@@ -224,8 +224,7 @@ public function setMetadataFor($className, $class)
 
         $this->cacheDriver->save(
             $className . $this->cacheSalt,
-            $this->loadedMetadata[$className],
-            null
+            $this->loadedMetadata[$className]
         );
     }