All Cats Are Grey

The name of this release "All Cats Are Grey" is the title of a song by the The Cure.

changes since 0.0.4/0.0.5

No significant code changes in this release.

• added figure at top of readme
• added "intended audience" classifier in setup.py and changed Development Status to "Production/Stable"
• added Zenodo badge (doi:10.5281/zenodo.3260948)