added a default configuration to enable all the goodness of Symfony 3.3

recipes/symfony/framework-bundle/etc/packages/app.yaml

@@ -0,0 +1,29 @@
+services:
+    _defaults:
+        autowire: true
+        public: false
+
+    _instanceof:
+        Symfony\Component\Console\Command\Command:
+            tags: ['console.command']
+            public: true
+
+        Twig_ExtensionInterface:
+            tags: ['twig.extension']
+
+        Symfony\Component\EventDispatcher\EventSubscriberInterface:
+            tags: ['kernel.event_subscriber']
+
+        Symfony\Component\Form\FormTypeInterface:
+            tags: ['form.type']
+
+        Symfony\Component\Security\Core\Authorization\VoterInterface:
+            tags: ['security.voter']
+
+    App\:
+        resource: '../../src/{Command,Form,EventSubscriber,Twig,Voter}'
+
+    App\Controller\:
+        resource: '../../src/Controller'
+        public: true
+        tags: ['controller.service_arguments']