Allow Doctrine 2.4 to be installed

Author: jdespatis

composer.json

@@ -9,7 +9,7 @@
     "require": {
         "php": ">=5.3.3",
         "symfony/symfony": "2.3.*",
-        "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.*",