解决 OS X 10.10 下运行 brew 命令时出现的错误
自从升级到 Yosemite 后就没用过 brew 命令了，今天想要 search 某个包，但是在 Command Line 运行 brew 命令后就显示下面的错误信息：1
2/usr/local/bin/brew: /usr/local/Library/brew.rb: /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby: bad interpreter: No such file or directory
/usr/local/bin/brew: line 23: /usr/local/Library/brew.rb: Undefined error: 0