GEOT-4540, Error rendering very simple transparent 8 bit PNG images
 GEOT-4540, Error rendering very simple transparent 8 bit PNG images
GEOT-4540, Problems with 4 bits paletted imagery
Merge pull request #254 from simboss/upm

GEOT-4540, Error rendering very simple transparent 8 bit PNG images
Merge branch 'master' of git://github.com/geotools/geotools