Refactor CSS/JS on 'Contact Us' page (Core page)

[briri]

Refactor the Contact Us page to use Bootstrap.

This page will serve as an example/reference for how to implement forms on our other pages.
http://getbootstrap.com/css/#forms
http://getbootstrap.com/css/#buttons

Remove or replace the functionality in lib/assets/stylesheets/dmproadmap/forms.css and lib/assets/dmproadmap/javascripts/forms.js