Update skimage version, test CMYK images

BUG=skia:

Change-Id: Id0c9ba3c722304813e3605ef61b87fa00249eaf9
Reviewed-on: https://skia-review.googlesource.com/5449
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Robert Aftias <raftias@google.com>
2 files changed