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
126382000,MDExOlB1bGxSZXF1ZXN0NTU4NzU0NDk=,718,Update index.rst,358378,closed,0,,,1,2016-01-13T09:57:40Z,2016-01-13T16:37:56Z,2016-01-13T16:37:56Z,CONTRIBUTOR,,0,pydata/xarray/pulls/718,"fix link to mailing list
","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/718/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull
97237275,MDExOlB1bGxSZXF1ZXN0NDA4MzkzNjU=,495,ENH: finite difference method `diff`,358378,closed,0,,,12,2015-07-25T16:33:20Z,2015-08-21T18:13:00Z,2015-08-21T18:12:57Z,CONTRIBUTOR,,0,pydata/xarray/pulls/495,"adds `diff` method to both `DataArray` and `Dataset`. closes #490 

Still to be done:
- tests

Possible enhancements:
- allow numeric `axis` instead of `dim` for `DataArray` objects. The signature would then be `DataArray.diff(dim=None, n=1, axis=None)` and I would need to check that exactly one of `dim` and `axis` is `None`. I find it a bit ugly; `DataArray.diff(n=1, dim=None, axis=None)` would be nicer in my view.  But then the signatures for `DataArray.diff` and `Dataset.diff` would be different, which is also not nice.
- allow specifying the new coordinate array explicitly via a `coord` kwarg instead of just taking the coordinate values of the upper bounds.

What do you think?
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