Rewrite puavo-update-airprint-ddns script. Update _universal._sub._ipp._tcp.<domain> PTR record
puavo-update-airprint-ddns: refactor
puavo-update-airprint-ddns: PTR record does not need to be removed
puavo-update-airprint-ddns: update universal ipp record only if detect new printer
puavo-update-airprint-ddns: PTR record need to be remove before
puavo-update-airprint-ddns: refactor
puavo-update-airprint-ddns: send only one update message to dns server
puavo-update-airprint-ddns: add printers srv-host and txt-record to dns server
puavo-update-airprint-ddns: rename variable
puavo-update-airprint-ddns: add comments
puavo-update-airprint-ddns: use ruby1.9.3
puavo-update-airprint-ddns: print to STDOUT some messages
puavo-update-airprint-ddns: fix puavo rest url and add more error handling
puavo-update-airprint-ddns: add authorization header to rest request
puavo-update-airprint-ddns: fix rest url