fix combine_by_coords (#267)

* fix combine_by_coords

* change to new only for versions newer than previous xarray version

* fix tests

Remove unnecessary parts (#243)

Update development.rst (#242)

Bump version: 0.2.1 → 0.2.2

Bump version: 0.2.1 → 0.2.2

Doc updates (#45)

* small doc updates

* Bump version: 0.2.0 → 0.3.0

* Bump version: 0.3.0 → 0.2.1

Bump version: 0.1.0 → 0.2.0 (#38)

* Bump version: 0.1.0 → 0.2.0

* minor doc fix