Add QR codes

So, I don't know Haskell :-)

This *should* print a QR code with the URL in it.

Ideally, this should probably use something like http://hackage.haskell.org/package/haskell-qrencode-1.0.3/docs/Data-QRCode.html

And the URL should probably be run through http://hackage.haskell.org/package/urlencoded-0.3.0.0/docs/Data-URLEncoded.html