Update to latest pom-scijava version

Includes the latest dependencies, specifically scifio 0.15.3.
Improve color table support

If a reader does not have a ColorTable, but we do have a Color object in
the Bio-Formats metadata, we can create a black : color ramp using that
Color.

NB: Color is an 8-bit color and thus must be chunked to get a 16-bit
color table.

NB: the color table is currently not being cached.
Bump to next development cycle

Signed-off-by: Mark Hiner <hinerm@gmail.com>