Setup app to use Heroku Node.js buildpack

This should accommodate both node and ruby functionality.
Update the version of gaslight_training
Remove old copy from contact page
Remove unused component CSS
Style contact header
Separate footer and work with us
Style pages to adapt to new contact-footer
Add work with us partial to all relevant pages
Update contact us form

* Remove modal submission
* Remove human validation
* Send users to home page after submission
* Style the flash message
* Add company to form
Update styles on contact form
Style all static type on contact page
Tweak whole contact page design
Responsive style for contact page
Less business
Copy change per Michelle
Remove work with us footer from case studies
Use link_to helpers in place of haml anchors
Markup cleanup
Convert erb view to haml
Merge pull request #125 from gaslight/update-contact

Update contact