Add test for 3D images
Add test for 3D images

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