Merge pull request #360 from kiddivouchers/fix-ptr-delete

Fix deleting PTR records

Author: Jamie Hannaford

lib/OpenCloud/DNS/Resource/PtrRecord.php

@@ -111,7 +111,8 @@ public function delete()
         }
 
         $url = clone $this->getUrl();
-        $url->addPath('rdns')
+        $url->addPath('..')
+            ->normalizePath()
             ->addPath($this->link_rel)
             ->setQuery($params);