include index.dask in set_index computation
include index.dask in set_index computation

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