http://www.cnblogs.com/huang0925/archive/2013/05/17/3083207.html
http://wil.boayue.com/blog/2013/06/14/using-npm-behind-a-proxy/
http://www.jianshu.com/p/d9b1273a93fd
NPM:
npm --proxy=http://username:password@proxyserver:port --proxy-https=http://username:password@proxyserver:port --registry=http://registry.npmjs.org/