Update linters

* Update eslint and stylelint config
* Fix Gruntfile.js to actually run stylelint

scripts/.eslintrc.json

@@ -0,0 +1,6 @@
+{
+	"root": true,
+	"extends": [
+		"wikimedia/server"
+	]
+}

scripts/transform.js

@@ -1,4 +1,4 @@
-var through = require( 'through' ); // eslint-disable-line no-implicit-globals
+var through = require( 'through' );
 
 module.exports = function () {
 	var data, end, write;