bumped min PHP version to 5.3.9

Author: fabpot

composer.json

@@ -16,7 +16,7 @@
         }
     ],
     "require": {
-        "php": ">=5.3.3",
+        "php": ">=5.3.9",
         "symfony/event-dispatcher": "~2.5.9|~2.6,>=2.6.2|~3.0.0",
         "symfony/http-foundation": "~2.5,>=2.5.4|~3.0.0",
         "symfony/debug": "~2.6,>=2.6.2|~3.0.0",