mrocklin / dask / 2870

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travis-ci

Move blockwise_meta to more general compute_meta function (#4954)

* Move blockwise_meta to more general compute_meta function
* improve handling around meta.astype

1.  We now allow non-array meta.  This ends up being common in temporary
    arrays for gufuncs and reductions
2.  Users can now specify explicit meta= in blockwise
3.  We no longer expect metas to support the astype method

* properly support gufuncs
* Use numpy sum function rather than method
* Test that metadata of an h5py dataset is a numpy array
* Add meta= keyword to from_array
* Support meta as type input

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