Added dependency to apache commons lang library as it has some nice utilities for lang objects.
Added Mailer class to as a utility class to support the sending of e-mails from the site.
Added contact us template to the pages.js.soy
Added contact-us page and hooked it up to the main navigation. Added javascript form intersept code (needs to be tidied up and made general - for now it does what we need to do for this page though).