Updated Composer dependencies to require the Security\Csrf component where necessary

Author: webmozart

composer.json

@@ -25,6 +25,7 @@
     "require-dev": {
         "symfony/form": "~2.0",
         "symfony/routing": "~2.2",
+        "symfony/security-csrf": "~2.4",
         "psr/log": "~1.0"
     },
     "suggest": {