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
337676676,MDExOlB1bGxSZXF1ZXN0MTk4Nzk4ODc0,2264,"WIP DataArray.plot() can now plot errorbars with kwargs xerr, yerr",2448579,closed,0,,,4,2018-07-02T21:52:32Z,2022-10-18T19:15:56Z,2019-08-15T15:32:58Z,MEMBER,,0,pydata/xarray/pulls/2264," - [x] Tests added (for all bug fixes or enhancements)
 - [x] Tests passed (for all non-documentation changes)
 - [x] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API (remove if this change should not be visible to users, e.g., if it is an internal clean-up, or if this is part of a larger project that will be documented later)

Added support for errorbar plotting. This works by providing the kwargs `xerr` and/or `yerr` to `plot()` or `plot.line()`. It will only work for 1D data. 

Errorbars for plots that use`hue` argument require that we loop and plot each line individually. I'm happy to add this is you think it's a good idea.

Example from docs: 
`air.isel(time=10, lon=10).plot.line(y='lat', xerr=3, yerr=1.5, ecolor='r')`

![image](https://user-images.githubusercontent.com/2448579/42188123-e20cdde8-7e0f-11e8-97ae-d0405a2df9b4.png)
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