- Also refactor and improve hypothesis tests.
- Add a test that ordered bidict nodes have no reference cycles.
- Enable coverage on Travis for PyPy 2 now that there is a code path
that is only taken on PyPy 2 (for FrozenOrderedBidict.iteritems).
- Restore running tests on Travis for all commits, not just for master.
- Docs:
- OrderedBidict: "What if my Python version has order-preserving dicts?"
- Equivalent but distinct Hashables: better code example demonstrating
that this even occurs with a bidict and its own inverse.