Use is_dataframe/index_like in dd.utils (#4657)
Use is_dataframe/index_like in dd.utils (#4657)


mrocklin/dask,jcrist/dask,jakirkham/dask,jcrist/dask,mrocklin/dask,dask/dask,ContinuumIO/dask,jakirkham/dask,blaze/dask,blaze/dask,dask/dask,ContinuumIO/dask