releases: 492208

This is major release that includes some new features and quite a few bug fixes. Here are the highlights: - There is now a direct constructor for DataArray objects, which makes it possible to create a DataArray without using a Dataset. This is highlighted in the refreshed tutorial. - You can perform aggregation operations like mean directly on xray.Dataset objects, thanks to Joe Hamman. These aggregation methods also worked on grouped datasets. - xray now works on Python 2.6, thanks to Anna Kuznetsova. - A number of methods and attributes were given more sensible (usually shorter) names: labeled -> sel, indexed -> isel, select -> select_vars, unselect -> drop_vars, dimensions -> dims, coordinates -> coords, attributes -> attrs. - New Dataset.load_data and Dataset.close methods for datasets facilitate lower level of control of data loaded from disk.