update to PSR-4

Author: xabbuh

composer.json

@@ -24,12 +24,11 @@
         "doctrine/phpcr-bundle": "1.*",
         "doctrine/phpcr-odm": "1.*"
     },
-    "autoload":{
-        "psr-0":{
-            "Symfony\\Cmf\\Bundle\\TreeBrowserBundle": ""
+    "autoload": {
+        "psr-4": {
+            "Symfony\\Cmf\\Bundle\\TreeBrowserBundle\\": ""
         }
     },
-    "target-dir": "Symfony/Cmf/Bundle/TreeBrowserBundle",
     "extra": {
         "branch-alias": {
             "dev-master": "1.0-dev"