Revert "Updated to most recent CMF RC versions"

This reverts commit 1febe6a.

Author: wouterj

composer.json

@@ -29,9 +29,9 @@
 
         "symfony-cmf/symfony-cmf": "^2.0@dev",
         "symfony-cmf/seo-bundle": "^2.0",
+        "symfony-cmf/tree-browser-bundle": "^2.0@dev",
+        "symfony-cmf/content-bundle": "^2.0@dev",
         "symfony-cmf/block-bundle": "^2.0@dev",
-        "symfony-cmf/routing": "^2.0@RC",
-        "symfony-cmf/slugifier-api": "^2.0@RC",
         "symfony-cmf/routing-auto-bundle": "^2.0",
         "symfony-cmf/sonata-phpcr-admin-integration-bundle": "^1.0@dev",