Add support for `brew cask install friture`

[shawwn]

Homebrew Cask is a very popular package manager. Most OS X programs can be installed using brew cask install foo.

It would be pretty easy to add friture, so I thought I'd mention it.

[tlecomte]

Thanks for mentioning this package manager. I unfortunately no longer have access to any mac hardware, which is why #57 is still open by the way...