issues: 99832521

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
99832521 MDExOlB1bGxSZXF1ZXN0NDE5NjAxODk= 520 added to_masked_array method and masked_array property 2443309 closed 0   1213895 4 2015-08-08T20:47:41Z 2015-08-12T18:34:17Z 2015-08-12T18:34:16Z MEMBER   0 pydata/xarray/pulls/520

This PR adds convienience methods to convert DataArrays to numpy masked arrays.

DataArray.to_masked_array(copy=True) returns a numpy Masked array

DataArray.masked_array returns a masked array that is a view to the DataArray.values.

closes #460 

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