A simple environment for her
Just run
gulp set
gulp
Install bootstrap running this command in your proyect folder
npm install bootstrap@4.0.0-alpha.6
Once run this command to add bootstrap files to yours
gulp add_bootstrap
Add links and scripts to your haml files
%link{rel: "stylesheet", href:"css/bootstrap.min.css"}/
%script{src: "js/bootstrap.js"}
Compile and run your server again
gulp prepare
gulp