Improve heuristic used when saving progressive and optimized JPEGs with high quality values.
Make test_file_jpeg compatible with Python 3
Try to fix test_file_jpeg in Python3
Another attempt to achieve python 3 compatibility.
Merge pull request #504 from e98cuenc/highquality

Improve heuristic used when saving progressive and optimized JPEGs with high quality values.
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fixes #528

Accept 0 as transparency value.
fixes #529

doc fix
Merge pull request #531 from d-schmidt/patch-3

Doc fix -- Image.paste is in place. Fixes #529
Added test for Palette transparency=0
Updated changes
Merge pull request #533 from wiredfool/fix_528

Fix for  transparency = 0 in PNG mode P images
Merge Changes from master