Add test for compact watershed
Add test for compact watershed

rjeli/scikit-image,rjeli/scikit-image,vighneshbirodkar/scikit-image,paalge/scikit-image,paalge/scikit-image,vighneshbirodkar/scikit-image,vighneshbirodkar/scikit-image,paalge/scikit-image,rjeli/scikit-image