[Image-SIG] Adding Python 3 support

[James]

I'm not a dev, just a user.  Adding my 2 cents.

I'd say having 1.1.7 around for Python 2.5 seems sufficient.  2.5 is
old, 1.1.7 is stable, it should fit most use cases there.

I'd much rather drop 2.5 support and gain 3.x for PIL.  Keeping 2.6
support would be a very good thing.  Even though 2.6 is old, it's
still very useful (and actively used many places, like system Python
installs, etc).

-James