Retrieve image size info from EXIF IFD if possible #35
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Some images saved with newer versions of Photoshop no longer carry the JFIF data but only the EXIF data including EXIF IFD. As a result of that, image size info needs to be extracted from EXIF instead of the JFIF header. See http://www.cipa.jp/std/documents/e/DC-008-2012_E.pdf for info about the JPEG/EXIF format. Fixes #34
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Fixes #34