Allow rechunk to accept a Dask array

[tomwhite]

Addresses #21.

[codecov]

Codecov Report

Merging #27 into master will increase coverage by 1.35%.
The diff coverage is 81.81%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   88.94%   90.30%   +1.35%     
==========================================
  Files           2        2              
  Lines         190      196       +6     
  Branches       44       45       +1     
==========================================
+ Hits          169      177       +8     
+ Misses         11       10       -1     
+ Partials       10        9       -1     

Impacted Files	Coverage Δ
rechunker/api.py	93.12% <81.81%> (+0.32%)	⬆️
rechunker/algorithm.py	84.61% <0.00%> (+3.07%)	⬆️

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[rabernat]

This is perfect @tomwhite. Thanks so much for your contribution!

I'd like to start keeping track of things in https://github.com/pangeo-data/rechunker/blob/master/docs/release_notes.rst. Could you just add a bullet about this new feature? Then we are good to merge.

[tomwhite]

Thanks @rabernat! Updated the release notes.

[rabernat]

I'll merge this. I'd like to disable the codecov/patch check as I don't think it's helpful.

Thanks @tomwhite!