This is the first **beta version** of NURBS-Python v4.x series.
* Updated `NURBS` class control points / weights getters and setters
* Rearranged / updated some functions and properties to clean up the `BSpline` and `NURBS` class structure
* Control points reading and CSV export functionality are moved to `exchange` module
* Added more tests
* Updated examples
* Evaluation algorithms speed improvements
* Added [Plotly](https://plot.ly/python/) visualization module
* Updated documentation and added more details
* Added new export file formats
* Added B-Spline to NURBS converters
4.x update might break `NURBS` class API a little bit due to the updates in getters and setters but the fix would be very easy: Please see the `ctrlptsw` and `ctrlpts` properties for details.