Add Firefox Beta for Chinese (Simplified)
user
```ruby
class FirefoxBetaCn < Cask
  url 'https://download.mozilla.org/?product=firefox-29.0b2&os=osx&lang=zh-CN'
  homepage 'https://www.mozilla.org/zh-CN/firefox/beta/'
  version '29.0b2'
  sha256 '9ed32e46990d9f16139c31002a4fd93739dec401c9c6cb518c1a0bf78ee0f435'
  link 'Firefox.app'
end
```
assistant