Merge pull request #2268 from Ocramius/hotfix/#2260-loosen-doctrine-common-requirement

#2260 - loosening doctrine/common requirement: allowing 2.6.x

composer.json

@@ -13,7 +13,7 @@
     ],
     "require": {
         "php": ">=5.3.2",
-        "doctrine/common": ">=2.4,<2.6-dev"
+        "doctrine/common": ">=2.4,<2.7-dev"
     },
     "require-dev": {
         "phpunit/phpunit": "4.*",