This PR has the objective of...

Changes

Checklist

Checklist for for pull requests including new code and/or changes to existing code...

Code
- Includes unit tests
- New functions have docstrings with examples that can be run with doctest
- New functions are included in API docs
- Docstrings include notes for any changes to API or behaviour
- All changes documented in docs/changes.rst
Testing
- (Optional) Tested local against remote servers
- Travis CI passes (unit tests run under Linux)
- AppVeyor CI passes (unit tests run under Windows)
- Unit test coverage has not decreased (see Coveralls)
Changes
- (Optional) Just a proof of concept
- (Optional) Work in progress
- Ready to review
- Ready to merge