removed doubled variable from setup.py
Python 3-ified _imagingcms.c and display.c, at least when compiling for Py3.3x64 on Win7x64 with MSVC10.
Added support for PNG images with transparency palette
remove double variable from setup.py
Merge pull request #47 from d-schmidt/master

Solved issue #46 and picked the last missing py3k changes