node.js 压缩混淆js代码

参考：http://www.ydcss.com/archives/18

http://www.open-open.com/lib/view/open1446008460804.html

http://jingyan.baidu.com/article/f79b7cb37ec0219145023e79.html

http://www.tuicool.com/articles/BZFV73

http://www.gowhich.com/blog/621

http://www.07net01.com/2015/09/933061.html