coffee-worldのインストール node.jsが最新すぎてnpmが未対応？

 $ cd /work/git

$ git clone https://github.com/khoomeister/coffee-world.git
$ npm install coffee-world
coffee-world@0.0.7 ./node_modules/coffee-world
├── coffee-script@1.1.2
├── coffeekup@0.3.1
└── coffee-css@0.0.5