BUG: not converting series with CategoricalIndex

[jreback]

xray 0.6.1

In [1]: s = Series(range(5),index=pd.CategoricalIndex(list('aabbc'),name='foo'))

In [4]: xray.DataArray.from_series(s)
ValueError: object __array__ method not producing an array

[shoyer]

Yep, we were relying on .values to return a NumPy array. This should be an easy fix.

[shoyer]

This works now (tested with xarray v0.9):

In [7]: s.to_xarray().indexes['foo']
Out[7]: CategoricalIndex(['a', 'a', 'b', 'b', 'c'], categories=['a', 'b', 'c'], ordered=False, name='foo', dtype='category')