Final check on regression data, tidy up tests (#17)

* Improve doc.

* Finalised checked on Windows.

Add concurrency. (#12)

* Add concurrency.

* check concurrency

* Add to docs.

* Remove from build wheels because it does not run on PR branches.

Dont bundle libzstd.

Merge pull request #5 from rallyplot/fix_macos_build

Fix build on macOS

Handle pythonBindings import for docs properly, add toy data test.

Add rallyplot url to docs.

Initial release.