Use PSR4

Author: hlecorche

composer.json

@@ -18,7 +18,7 @@
         "ecommit/util-bundle": "2.4.*@dev"
     },
     "autoload": {
-        "psr-0": { "Ecommit\\JavascriptBundle": "" }
+        "psr-4": { "Ecommit\\JavascriptBundle\\": "" }
     },
     "target-dir": "Ecommit/JavascriptBundle",
     "extra": {