I started using EmberJS and ember-cli for a new project. Therefore I created a new project with ember-cli and added broccoli-compass with sass support. When I execute "ember server" in the terminal, ember is just watching for file changes on /app/styles/app.scss. I want ember-cli to also reload on file changes in subdirectories of the /app/styles folder (e.g. /app/styles/helpers/breakpoints.scss). How can I configure ember-cli for this purpose?