Relax composer requirements

composer.json

@@ -19,9 +19,9 @@
     ],
     "require": {
         "php": ">=5.3.0",
-        "symfony/console": "2.*",
-        "symfony/finder": "2.*",
-        "symfony/process": "2.*"
+        "symfony/console": ">2.0,<2.2-dev",
+        "symfony/finder": ">2.0,<2.2-dev",
+        "symfony/process": ">2.0,<2.2-dev"
     },
     "recommends": {
         "ext-zip": "*"