Support for converting IPv6 to Text

[Porges]

IPv4 has encode :: IPv4 -> Text, but the corresponding function doesn't exist for IPv6

[andrewthad]

This look good. Thanks for writing tests too. Performance won't be great (to get the best performance, you'd have to allocate a buffer unfront and then do writes indexing the appropriate positions), but it's much better to have something slow than nothing ;)

[andrewthad]

PR has been merged. New hackage realease 0.9.2 includes this and the parser fix.

[Porges]

Thanks!