http://localhost:631/printers/
http://blog.somerandomcompany.com/2011/12/fun-with-airprint-bonjour-and-dns.html
http://edoceo.com/howto/cups-airprint
http://www.finnie.org/2010/11/13/airprint-and-linux/
https://developer.apple.com/bonjour/printing-specification/bonjourprinting-1.2.pdf