pydata / xarray / 2538

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Options to binary ops kwargs (#1065)

* Added join key to OPTIONS, used in dataarray & dataset binary ops, with a test module in test_dataarray.py

* Added binary_ops test to test_dataset.

* Changed variable names according to review comments.

* Changed default key to arithmetic_join, and shortened tests.  Also added to computation.rst and whats-new.rst

* Emphasis on context manager for xr.set_options() use.

* Changed to actual vs expected testing nomenclature.

* Applies join options to Dataset.data_vars as well.

* Preserve order of joined data_vars, left-to-right.  Use np.nan as default filler.

* PEP8 and doctring.

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