Merge pull request #236 from symfony-cmf/prepare_2.1

prepare composer to go to next version

Author: ElectricMaxxx

composer.json

@@ -46,7 +46,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "2.0-dev"
+            "dev-master": "2.1-dev"
         }
     }
 }