Update py-IP to 0.75.
while here,
 * convert to register egg-info
 * add test target

Version 0.75 (2011-04-12)
-------------------------

 * IP('::/0').netmask() gives IP('::') instead of IP('0.0.0.0')

Version 0.74 (2011-02-16)
-------------------------

 * Fix tests for Python 3.1 and 3.2
 * ip.__nonzero__() and (ipa in ipb) return a bool instead of 0 or 1
 * IP('0.0.0.0/0') + IP('0.0.0.0/0') raises an error, fix written by Arfrever

Version 0.73 (2011-02-15)
-------------------------

 * Support Python 3: setup.py runs 2to3
 * Update the ranges for IPv6 IPs
 * Fix reverseName() and reverseNames() for IPv4 in IPv6 addresses
 * Drop support of Python < 2.5

Version 0.72 (2010-11-23)
-------------------------

 * Include examples and MANIFEST.in in source build (add them to
   MANIFEST.in)
 * Remove __rcsid__ constant from IPy module

Version 0.71 (2010-10-01)
-------------------------

 * 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)


(obache)