Changed Color.grayscale_bytes to use the B byte instead of the R byte, to be more consistent with the encoding implementation.
Changed Color.grayscale_bytes to use the B byte instead of the R byte, to be more consistent with the encoding implementation.

Because R G and B should have the same value for a grayscale pixel, this doesn't really change anything.
travis-repos/chunky_png,bshakr/chunky_png,wvanbergen/chunky_png,lencioni/chunky_png