[mapping] finish mapping refactoring, closes #199

lib/Gedmo/Mapping/ExtensionMetadataFactory.php

@@ -83,6 +83,9 @@ final class ExtensionMetadataFactory
                 if ($cmf->hasMetadataFor($parentClass)) {
                     $class = $this->objectManager->getClassMetadata($parentClass);
                     $this->driver->readExtendedMetadata($class, $config);
+                    if (!$class->isInheritanceTypeNone() && $config) {
+                        $useObjectName = $class->name;
+                    }
                 }
             }
         }