pngcrush: Optimize PNG image files

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    2016-06-08 07:48      557694 usr/bin/pngcrush.exe
    2016-06-08 07:48           0 usr/share/
    2016-06-08 07:48           0 usr/share/doc/
    2016-06-08 07:48           0 usr/share/doc/Cygwin/
    2016-06-08 07:48        5647 usr/share/doc/Cygwin/pngcrush.README
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    2016-06-08 07:48       41524 usr/share/doc/pngcrush/ChangeLog.html
    2016-06-08 07:48        3207 usr/share/doc/pngcrush/LICENSE
    2016-06-08 07:48         237 usr/share/doc/pngcrush/README_master.txt
    2016-06-08 07:48           0 usr/share/man/
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