Fix dependencies requirements

Author: olaurendeau

composer.json

@@ -5,19 +5,11 @@
     "require": {
         "php": ">=5.3",
         "richardfullmer/rabbitmq-management-api": "^1.0",
-        "symfony/config": "2.2.*",
-        "symfony/console": "2.2.*",
-        "symfony/framework-bundle": "2.2.*",
-        "symfony/dependency-injection": "2.2.*",
-        "symfony/http-kernel": "2.2.*",
-        "symfony/http-foundation": "2.2.*",
-        "symfony/event-dispatcher": "2.2.*",
-        "symfony/filesystem": "2.2.*",
-        "symfony/translation": "2.2.*",
-        "symfony/routing": "2.2.*",
-        "symfony/templating": "2.2.*",
-        "symfony/stopwatch": "2.2.*",
-        "symfony/debug": "2.3.*"
+        "symfony/config": ">=2.1",
+        "symfony/console": ">=2.1",
+        "symfony/framework-bundle": ">=2.1",
+        "symfony/dependency-injection": ">=2.1",
+        "symfony/http-kernel": ">=2.1"
     },
     "require-dev": {
         "matthiasnoback/symfony-dependency-injection-test": "0.*",