Rename voter.yaml file to security.yaml

For consistency with other bundles voters are\
registered under the security.yaml file.

src/Bundle/ChillDocStoreBundle/DependencyInjection/ChillDocStoreExtension.php

@@ -42,7 +42,7 @@ class ChillDocStoreExtension extends Extension implements PrependExtensionInterf
         $loader->load('services/fixtures.yaml');
         $loader->load('services/form.yaml');
         $loader->load('services/templating.yaml');
-        $loader->load('services/voter.yaml');
+        $loader->load('services/security.yaml');
     }
 
     public function prepend(ContainerBuilder $container)