mac ios : homebrew package manager

http://brew.sh/
http://ihower.tw/blog/archives/4308
https://gist.github.com/mxcl/323731
http://blog.lyhdev.com/2011/06/homebrew-mac-os-x.html
http://wildjcrt.pixnet.net/blog/post/29182044-the-naming-logic-from-homebrew