Update mailjet.js (GoogleCloudPlatform#125)

* Update mailjet.js

configuring this with the nodemailer   {service: "mailjet"} sets the port to 587, which is blocked by the google.  This setup configuration works.

Author: CRoed

Diff for: computeengine/mailjet.js

@@ -18,7 +18,8 @@ var mailer = require('nodemailer');
 var smtp = require('nodemailer-smtp-transport');
 
 var transport = mailer.createTransport(smtp({
-  service: 'Mailjet',
+  host: 'in.mailjet.com',
+  port: 2525,
   auth: {
     user: process.env.MAILJET_API_KEY || '<your-mailjet-api-key',
     pass: process.env.MAILJET_API_SECRET || '<your-mailjet-api-secret>'