Add RGBA support to ImageColor
Fix imagecolor test issue
Merge pull request #311 from cezarsa/master

Added IGNORE_DECODING_ERRORS flag to ImageFile allowing corrupted images to load
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Revert "Added IGNORE_DECODING_ERRORS flag to ImageFile allowing corrupted images to load"

This reverts commit 156a443cdf8e62ca8e942d024f9bcf212a12180b.
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Merge pull request #309 from yoavweiss/master

Add RGBA support to ImageColor
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Fix IOError when saving progressive JPEGs.

when the jpeg encoder sees the flags optimize or progressive (or progression)
it will write the full image in one shot.

The bufsize needs to be big enough to hold the entire image. The current heuristic
is that the entire compressed image will fit in width * height bytes, but this
heuristic is only applied to save operations with the flag "optimize" and not to
save operations with the flag "progressive".

This patch fixes this oversight.

(Btw, it will probably be a good idea to have a loop that retries with a bigger
bufsize in case this guess is not big enough.)
fix Issue #312
improve palette handling while saving gif and png
Merge pull request #313 from e98cuenc/progressive

Fix IOError when saving progressive JPEGs.
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reorganized gif optimize to work with palette parameter
replace custom search with dict in gif optimize
be more tolerant of tag read failures

this can occur if the MakerNote has a pointer to outside the EXIF block
Catch truncated zTXt errors.
Python3 fix.
issue warning instead of debug/print
adding prerequisites for tk to the readme
added raspian prereqs