Use PSR-4

Author: GuilhemN

composer.json

@@ -36,9 +36,8 @@
         "willdurand/propel-typehintable-behavior": "The Typehintable behavior is useful to add type hints on generated methods, to be compliant with interfaces"
     },
     "autoload": {
-        "psr-0": { "FOS\\OAuthServerBundle": "" }
+        "psr-4": { "FOS\\OAuthServerBundle\\": "" }
     },
-    "target-dir": "FOS/OAuthServerBundle",
     "extra": {
         "branch-alias": {
             "dev-master": "1.4-dev"