Error when install hubot

1. nodejs 版本问题，这个在安装 hubot 时，会提示，5-7，需重新安装

2. brew update 问题，这是需更新 nodejs 时，发现 brew 仓库很旧，更新时发现：

error: The following untracked working tree files would be overwritten by merge:
Library/Formula/cocot.rb
Please move or remove them before you can merge.

删除对应，并最好进入原 brew 目录进行更新；

3. nodejs 的更新无法覆盖相关目录，自行删除 include、share、lib等目录下 nodejs 相关文件即可

brew link node

4. coffee 1.3.1 和前面版本的 parseInt 解析方式不同

in CoffeeScript version 1.2.0

coffee> parseInt(0o0755, 8)
Error: In repl, Parse error on line 1: Unexpected 'IDENTIFIER'
    at Object.parseError (/usr/local/lib/node_modules/coffee-script/lib/coffee-script/parser.js:470:11)
    at Object.parse (/usr/local/lib/node_modules/coffee-script/lib/coffee-script/parser.js:546:22)
    at /usr/local/lib/node_modules/coffee-script/lib/coffee-script/coffee-script.js:40:22
    at Object.eval (/usr/local/lib/node_modules/coffee-script/lib/coffee-script/coffee-script.js:123:10)
    at Interface.<anonymous> (/usr/local/lib/node_modules/coffee-script/lib/coffee-script/repl.js:51:34)
    at Interface.emit (events.js:67:17)
    at Interface._onLine (readline.js:162:10)
    at Interface._line (readline.js:426:8)
    at Interface._ttyWrite (readline.js:603:14)
    at ReadStream.<anonymous> (readline.js:82:12)