Add ES6 support to more files

test/javascripts/helpers/parse-html.js.es6

@@ -0,0 +1,8 @@
+/* global Tautologistics */
+export default function parseHTML(rawHtml) {
+  const builder = new Tautologistics.NodeHtmlParser.HtmlBuilder();
+  const parser = new Tautologistics.NodeHtmlParser.Parser(builder);
+
+  parser.parseComplete(rawHtml);
+  return builder.dom;
+}