oxnet 0.1.1

• Adds is_subnet_of/is_supernet_of/overlaps, for verifying disjoint
  ranges. Previously this was only on IPv6.
• Adds is_network_address, for checking that none of the host bits are set
  (and ensuring we have a canonical form).
• Adds is_multicast and is_loopback (forwards to std/core).

oxnet 0.1.0

Initial release.