以下のgemが必要らしい。
multi_json sass tilt turbolinks-source turbolinks binding_of_caller uglifier sdoc jbuilder spring coffee-rails jquery-rails sass-rails listen rb-fsevent spring-watcher-listen -v '2.0.1' web-console -v '3.3.1'
$ sudo `which gem` install multi_json sass tilt turbolinks-source turbolinks \ binding_of_caller uglifier sdoc jbuilder spring coffee-rails jquery-rails \ sass-rails listen rb-fsevent --no-ri --no-rdoc