declare support for python 3.3

Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
Prepare for release 1.3.3

Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
Update announcement for release 1.3.3

Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>