Fix security-acl deps

Author: nicolas-grekas

composer.json

@@ -18,6 +18,7 @@
     "require": {
         "php": ">=5.3.3",
         "symfony/security": "~2.2",
+        "symfony/security-acl": "~2.2",
         "symfony/http-kernel": "~2.2"
     },
     "require-dev": {