caskroom/homebrew-cask — pull request #5371 by vinkla (2014-07-16 07:51:22+00:00)
Title: Upgrade VirtualBox to v4.3.14

How can we set this cask up with the new conventions? The version number differs in the URL, setting up
`#{version}` would still mean that you need to update the URL with a key (in this case `95030`).

Maybe we can add an extra parameter just below version number?
```ruby
class Virtualbox < Cask
version '4.3.14'
key '95030'

sha256 'c89b22f3e5ba5d93ccf762c5922c1f21d2c4e7c21b9487d892ac0516d6f4d55a'

url "http://download.virtualbox.org/virtualbox/#{version}/VirtualBox-#{version}-#{key}-OSX.dmg"
homepage 'http://www.virtualbox.org'

install 'VirtualBox.pkg'
uninstall :script => { :executable => 'VirtualBox_Uninstall.tool', :args => %w[--unattended] }
end
```