Add Art Director's Toolkit 5.1.1
user
```ruby
cask :v1 => 'art-directors-toolkit' do
  version '5.5.1'
  sha256 '6b15214f4f928d8519836cd6e60b4f72ecf9365ebc2f29a931c32b81babaddff'

  url "http://www.code-line.com/download/ArtDirectorsToolkit#{version.to_i}i.zip"
  name 'Art Directors Toolkit'
  homepage 'http://code-line.com/artdirectorstoolkit'
  license :commercial

  app "Art Directors Toolkit #{version.to_i}i.app"

  zap :delete => '~/Library/Preferences/com.code-line.artdirectorstoolkit*.plist'
end
```
assistant