test lowest requirements and require new enough versions

Author: lsmith77

composer.json

@@ -18,15 +18,16 @@
         "symfony/framework-bundle": "~2.3",
         "doctrine/phpcr-bundle": "~1.1",
         "doctrine/phpcr-odm": "~1.1",
-        "knplabs/knp-menu-bundle": "~2.0,>=2.0.0",
-        "knplabs/knp-menu": "~2.0,>=2.0.0",
-        "symfony-cmf/core-bundle": "~1.1,>=1.1.0"
+        "knplabs/knp-menu-bundle": "~2.0,>=2.0.0@stable",
+        "knplabs/knp-menu": "~2.0,>=2.0.0@stable",
+        "symfony-cmf/core-bundle": "~1.1,>=1.1.0-RC3"
     },
     "require-dev": {
         "twig/twig": "~1.12,>=1.12.1",
-        "symfony-cmf/routing-bundle": "~1.2,>=1.2.0",
+        "symfony-cmf/routing-bundle": "~1.2,>=1.2.0-RC3",
         "symfony-cmf/testing": "~1.2,>=1.2.6",
         "sonata-project/doctrine-phpcr-admin-bundle": "~1.1",
+        "symfony-cmf/tree-browser-bundle": ">=1.0.0-RC1",
         "sonata-project/block-bundle": ">=2.2.8",
         "sonata-project/core-bundle": ">=2.2.3",
         "symfony/monolog-bundle": "~2.3"