Adding Haml.
Adding Foundation.
Removing the ERB layout file.

This does break tests, due to not having adding the full_title helper method to the Haml layout, but that will be fixed.
Fixing the broken test.
Adding layout coffee script file

This will contain any global javascript calls.
Moving application.css to a Sass file.
Moving Welcome#index view to Haml

Not strictly related to adding Foundation, but since Haml was added, no
sense in waiting to make the move.