Adds a command to generates admin class, controller and services for a given entity

 - added sensio/generator-bundle to composer.json

composer.json

@@ -25,6 +25,7 @@
         "symfony/config": "~2.2",
         "symfony/console": "~2.2",
         "symfony/twig-bridge": "~2.2",
+        "sensio/generator-bundle": "~2.3",
         "twig/twig": "~1.12",
         "knplabs/knp-menu-bundle": "~1.1",
         "sonata-project/jquery-bundle": "1.8.*",