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**PR Summary**

- Please provide at least 1-2 sentences describing the pull request.

- What type of PR is this?

- [ ] library bug fix

- [ ] documentation bug fix

- [ ] new documentation

- [ ] new feature

- [ ] other

**[PR Checklist](http://matplotlib.org/devel/coding_guide.html#pull-request-checklist)**

- [ ] Code is [tested](http://matplotlib.org/devel/testing.html#testing) using[Py.test](https://docs.pytest.org/en/latest/) style tests) on Py2 and Py3

- [ ] Code is [PEP 8](https://www.python.org/dev/peps/pep-0008/) compliant

- [ ] New features are documented-and have an example if plot related

- [ ] Documentation is [sphinx](http://matplotlib.org/devdocs/devel/documenting_mpl.html) and [numpydoc](https://github.com/numpy/numpy/blob/master/doc/HOWTO_DOCUMENT.rst.txt) compliant

- [ ] Related issues and pull requests [are listed](https://help.github.com/articles/autolinked-references-and-urls/)

** Major Changes **

- [ ] non-trivial: made an entry in the [CHANGELOG](https://github.com/matplotlib/matplotlib/blob/master/doc/users/prev_whats_new/changelog.rst).

- [ ] major new feature: added an entry to [doc/users/whats_new.rst](https://github.com/matplotlib/matplotlib/tree/master/doc/users/whats_new).

- [ ] change the API in a backward-incompatible way: documented it in [doc/api/api_changes.rst](https://github.com/matplotlib/matplotlib/tree/master/doc/api/api_changes)

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