Fix the image importer in case of upper case letters in the suffix, e.g. name.JPG image.
Fix the image importer in case of upper case letters in the suffix, e.g. name.JPG image.

patricksnape/menpo,menpo/menpo,grigorisg9gr/menpo,yuxiang-zhou/menpo,mozata/menpo,yuxiang-zhou/menpo,grigorisg9gr/menpo,menpo/menpo,patricksnape/menpo,yuxiang-zhou/menpo,grigorisg9gr/menpo,patricksnape/menpo,mozata/menpo,menpo/menpo,mozata/menpo,mozata/menpo