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Fix for DIB/BMP images - #1813
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The DIB image format uses the 40 byte BMP header, followed by 3 masks for RGB channels. We were reading 4 masks, consuming the first pixel of the image. Mostly fixes issue python-pillow#1293. Remaining issue: alpha channel is actually a transparency mask.
This was referenced Apr 6, 2016
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Fixes #1293, probably #1810 and #1811 as well.
The DIB image file is slightly extended from the documentation that I've found. The fixes here are based on reverse engineering one individual file, with partial confirmation by published documentation.