Add site navigation, Bootstrap hooks and Rails logo
Add bootstrap-sass
Prettify typography, header and logo
Add FSEvent and update Guard gem

Also enable reloading of Guard/Spork when routes.rb is updated —
this previously required manually exiting and restarting.
Add partials and footer links
Use Sass
Update routes.rb and routes tests
Update links to use named routes
Prettify RSpec
Add Users controller and Sign up page