Cleanup redundancies in setup: Makefile, tox, make_coverage.py.
There are redundancies in the setup (Makefile, tox, make_coverage.py etc.). We should clean this up at some point. For instance, I only added tests examples
in Makefile, but not in tox.ini: https://gitlab.aicrowd.com/flatland/flatland/merge_requests/15/diffs?commit_id=a5d69ead4510c8a558b57870fa37373a9a6e99d1
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tox -e docs,coverage
also runs under Windows