Add code for lossless JPEG transformation - #63
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I try partically reimplement
jpegtrantool for convert some images to progressive JPEG.Also added:
exif.c/exif.hfor get image orientation (based on http://src.gnu-darwin.org/ports/x11-toolkits/gtk20/work/gtk+-2.12.3/gdk-pixbuf/io-jpeg.c);transupp.c/transupp.hfor lossless image rotation (copied from http://www.ijg.org/files/jpegsrc.v8d.tar.gz).I do not have deep knowledge of libjpeg, so something is not done well.