Add Dataset.to_pandas() method

[shoyer]

This would be the complement of the DataArray constructor, converting an xray.DataArray into a 1D series, 2D DataFrame or 3D panel, whichever is appropriate.

to_pandas would also makes sense for Dataset, if it could convert 0d datasets to series, e.g., pd.Series({k: v.item() for k, v in ds.items()}) (there is currently no direct way to do this), and revert to to_dataframe for higher dimensional input.

• DataArray method
• Dataset method

[stale]

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[shoyer]

I think this would still make logical sense if anyone wants to work on it.