[dns-operations] iOS recursive resolver compliance app now available

[Ray Bellis]

With thanks to the folks that volunteered to beta test this app, it's
now available (for free, of course) in the iOS App Store.

<https://itunes.apple.com/us/app/isc-dns-checker/id1141834002>

Please note that this isn't an official supported ISC product, it's just
one of my research projects.  If you have any feedback, please send it
to me direct.

Ray Bellis
ISC Research Fellow