Add TextMate 2.x alpha series
user
```ruby
class Textmate2 < Cask
  url 'https://github.com/textmate/textmate/releases/download/v2.0-alpha.9495/TextMate_2.0-alpha.9495.tbz'
  homepage 'http://macromates.com/'
  version '2.0-alpha.9495'
  sha1 '29f147fcbb6632c74cd7a7040d092cbee218b1e0'
  link 'TextMate.app'
end
```
assistant