Test unique on more data (#2846)
Test unique on more data (#2846)

Provides a few different datasets with different shapes, chunk sizes,
and value distributions. Gets all of `unique`s optional results to make
sure they all checkout correctly when compared to NumPy's `unique`.
Should provide some better assurances that Dask Array's `unique` works
correctly.
jcrist/dask,mrocklin/dask,jcrist/dask,jakirkham/dask,dask/dask,ContinuumIO/dask,dask/dask,blaze/dask,ContinuumIO/dask,blaze/dask,mrocklin/dask,jakirkham/dask