Updated composer.json to PSR-4 autoloader.

The PSR-0 format has been deprecated in favor of PSR-4. For details, see:

* http://www.php-fig.org/psr/psr-0/
* http://www.php-fig.org/psr/psr-4/
* php-fig/fig-standards@61f2d259

Author: jaakristioja

composer.json

@@ -26,10 +26,10 @@
 		"files" : [
 			"Interfaces.php"
 		],
-		"psr-0": {
-			"ValueFormatters\\": "src",
-			"ValueParsers\\": "src",
-			"ValueValidators\\": "src"
+		"psr-4": {
+			"ValueFormatters\\": "src/ValueFormatters/",
+			"ValueParsers\\": "src/ValueParsers/",
+			"ValueValidators\\": "src/ValueValidators/"
 		},
 		"classmap": [
 			"tests/ValueFormatters/ValueFormatterTestBase.php"