npm常用命令
http://www.cnblogs.com/linjiqin/p/3765772.html
npm 配置问题
http://blog.csdn.net/friendan/article/details/50866694
https://segmentfault.com/q/1010000004596263/a-1020000004596558
http://blog.csdn.net/oyuemijindu/article/details/50756024
npm删除模块
npm unstall 模块名