Prepare rc release (#308)

* prepare RC, enable RC versions of cmf packages

* also increase routing-bundle

Author: ElectricMaxxx

composer.json

@@ -23,7 +23,7 @@
     "require-dev": {
         "symfony/monolog-bundle": "~3.1",
         "symfony/phpunit-bridge": "^3.3 || ^4.0",
-        "symfony-cmf/routing-bundle": "^1.4 || ^2.0",
+        "symfony-cmf/routing-bundle": "^1.4 || ^2.1.0-RC1",
         "symfony-cmf/testing": "^2.1.0-RC1",
         "twig/twig": "^1.35 || ^2.4.4",
         "symfony-cmf/core-bundle": "^2.1.0-RC1",