npm 安装远程包（github的）
npm install git+ssh://git@github.com:xxx/xxx.git#master --save-dev
npm install git+ssh://git@github.com:npm/npm.git#v1.0.27
npm install git+https://isaacs@github.com/npm/npm.git
npm install git://github.com/npm/npm.git#v1.0.27
npm install git+ssh://git@github.com:xxx/xxx.git#master --save-dev
npm install git+ssh://git@github.com:npm/npm.git#v1.0.27
npm install git+https://isaacs@github.com/npm/npm.git
npm install git://github.com/npm/npm.git#v1.0.27
