fix #234 : implemented support for np.__array_ufunc__#762

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alixdamman wants to merge 3 commits intolarray-project:masterfrom

alixdamman:234_implement__array_ufunc__

Commits on Aug 19, 2019

moved imports into functions instead of on top of the module tests/common.py to avoid import loop problems
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Commits on Aug 20, 2019

- fix #234 : implemented support for np.__array_ufunc__
alixdamman
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set and updated documentation and doctests of functions derived in the ufuncs.py module
alixdamman
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