code: def default_app_directories
        StatDirectory.from_list([
          %w(Controllers        app/controllers),
          %w(Helpers            app/helpers),
          %w(Models             app/models),
          %w(Mailers            app/mailers),
          %w(Javascripts        app/assets/javascripts),
          %w(Libraries          lib),
          %w(APIs               app/apis)
        ], @root)
      end
docs: What Rails expects