Remove non-standard Composer commands

I'm reducing the confusing number of Composer commands to "cs", "test",
and "ci". Usually, PHPCS is executed before PHPUnit. This patch also
makes sure this order is consistent.

Author: thiemowmde

composer.json

@@ -62,18 +62,12 @@
 			"covers-validator"
 		],
 		"cs": [
-			"@phpcs",
-			"@phpmd"
+			"phpcs -p -s",
+			"phpmd src/ text phpmd.xml"
 		],
 		"ci": [
-			"@test",
-			"@cs"
-		],
-		"phpcs": [
-			"phpcs -p -s"
-		],
-		"phpmd": [
-			"phpmd src/ text phpmd.xml"
+			"@cs",
+			"@test"
 		]
 	}
 }