Set Twisted maxversion <15.2 for py3.2
Set Twisted maxversion <15.2 for py3.2

Even though Twisted doesn't seem to officially support python3.2,
Twisted-15.2 explicitly breaks the parts of Twisted that we're using
in sparts.

Set a max version for now, but we should consider disabling the Twisted
bits entirely for 3.2 in the long-term.

djipko/sparts,fmoo/sparts,fmoo/sparts,facebook/sparts,facebook/sparts,djipko/sparts