Ipy

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* Use xrange() instead of range()
* Use isinstance(x, int) instead of type(x) == types.IntType
* Prepare support of Python3 (use integer division: x // y)
* Fix IP(long) constructor: ensure that the address is not too large
* Constructor raise a TypeError if the type is not int, long,
str or unicode
* 223.0.0.0/8 is now public (belongs to APNIC)

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* New "major" version because it may break compatibility
* Fix __cmp__(): IP('0.0.0.0/0') and IP('0.0.0.0') are not equal
* Fix IP.net() of the network "::/0": "::" instead of "0.0.0.0".
IPy 0.63 should fix this bug, but it wasn't.

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* Create MANIFEST.in to fix setup.py bdist_rpm, fix by Robert Nickel

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* Fix formatting of "IPv4 in IPv6" network, eg. IP('::ffff:192.168.10.0/120'),
the netmask ("/120" in the example) was missing!

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* Fix reverse DNS of IPv6 address: use ".ip6.arpa." suffix instead of
deprecated ".ip6.int." suffix

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* Patch from Aras Vaichas allowing the [-1] operator
to work with an IP object of size 1.