[2.3] Add missing development dependencies

Author: romainneutron

composer.json

@@ -21,9 +21,12 @@
         "symfony/http-kernel": "~2.2"
     },
     "require-dev": {
+        "symfony/browser-kit": "~2.3",
+        "symfony/form": "~2.3",
         "symfony/framework-bundle": "~2.2",
         "symfony/twig-bundle": "~2.2",
         "symfony/form": "~2.1",
+        "symfony/process": "~2.0",
         "symfony/validator": "~2.2",
         "symfony/yaml": "~2.0"
     },