Add Builder support/options to xml2js

xml2js/xml2js-tests.ts

@@ -5,3 +5,13 @@ import xml2js = require('xml2js');
 xml2js.parseString("<root>Hello xml2js!</root>", (err: any, result: any) => { });
 
 xml2js.parseString("<root>Hello xml2js!</root>", {trim: true}, (err: any, result: any) => { });
+
+var builder = new xml2js.Builder({
+    renderOpts: {
+        pretty: false
+    }
+});
+
+var outString = builder.buildObject({
+    'hello': 'xml2js!'
+});