updated deps to stable versions when possible

Author: fabpot

composer.json

@@ -18,8 +18,8 @@
         "doctrine/doctrine-cache-bundle": "~1.2@dev",
         "symfony/security-acl": "~3.0@dev",
         "symfony/swiftmailer-bundle": "~2.3",
-        "symfony/monolog-bundle": "~2.7@dev",
-        "sensio/distribution-bundle": "~5.0@dev",
+        "symfony/monolog-bundle": "~2.8",
+        "sensio/distribution-bundle": "~5.0",
         "sensio/framework-extra-bundle": "^3.0.2",
         "incenteev/composer-parameter-handler": "~2.0"
     },