Added phpcpd, phpmd, and phpunit as dependencies

Author: tzikis

Symfony/composer.json

@@ -20,10 +20,14 @@
         "sensio/generator-bundle": "2.3.*",
         "incenteev/composer-parameter-handler": "~2.0"
     },
-		"require-dev": {
-			    "satooshi/php-coveralls": "dev-master"
-		},
-    "scripts": {
+	"require-dev": {
+		"phpunit/phpunit": "3.7.*",
+		"satooshi/php-coveralls": "dev-master",
+		"squizlabs/php_codesniffer": "1.*",
+		"sebastian/phpcpd": "*",
+		"phpmd/phpmd": "2.0.*"
+	},
+	"scripts": {
         "post-install-cmd": [
             "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
             "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",