Fix dask.array slicing edge case where slice.stop == 0
Fix dask.array slicing edge case where slice.stop == 0

closes gh-125

PhE/dask,hainm/dask,vikhyat/dask,gameduell/dask,jayhetee/dask,dask/dask,ContinuumIO/dask,blaze/dask,vikhyat/dask,wiso/dask,wiso/dask,mrocklin/dask,clarkfitzg/dask,mrocklin/dask,simudream/dask,ssanderson/dask,marianotepper/dask,ssanderson/dask,dask/dask,esc/dask,PhE/dask,jcrist/dask,ContinuumIO/dask,cpcloud/dask,chrisbarber/dask,jakirkham/dask,jcrist/dask,minrk/dask,minrk/dask,mikegraham/dask,hainm/dask,cowlicks/dask,esc/dask,jakirkham/dask,mraspaud/dask,blaze/dask,pombredanne/dask,jayhetee/dask,mraspaud/dask,freeman-lab/dask,clarkfitzg/dask,marianotepper/dask,simudream/dask,pombredanne/dask,freeman-lab/dask