Added a MANIFEST.in file to correctly upload the .pyx files to PyPI.
1.2.1
Smaller cleanups and slight changes to the interfaces and default parameters.
1.2.0
Dropped the Numba dependency. The fast 2D and 3D computations are now performed using Cython.
1.1
Improvements of the documentation, continuous integration and setup process. Documented the necessary steps to reproduce the benchmark. This version reflects the accepted version in the Journal of Open Source Software ([JOSS](https://github.com/openjournals/joss-reviews/issues/3641)).