also allow doctrine 2.4 to be installed

Author: Tobion

composer.json

@@ -9,7 +9,7 @@
     "require": {
         "php": ">=5.3.3",
         "symfony/symfony": "~2.4",
-        "doctrine/orm": ">=2.2.3,<2.4-dev",
+        "doctrine/orm": "~2.2,>=2.2.3",
         "doctrine/doctrine-bundle": "~1.2",
         "twig/extensions": "~1.0",
         "symfony/assetic-bundle": "~2.3",