Add converted images to test tiff compression

convert cs3n2c16.png temp.tif
tiffcp temp.tif -c lzw cs3n2c16.tif

tiffcp flower-rgb-contig-16.tif -c packbits flower-rgb-contig-16-packbits.tif
Merge pull request #62 from iger/tiff-test

Add converted images to test tiff compression