Gocept-month

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- Nothing changed yet.

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- Officially support Python 3.6.

- Fix `configure.zcml` to be compatible with Python 3.

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- Made the package compatible with Python 2.7 and Python 3 at the same time.

- Backwards-incompatible change towards stricter comparison behaviour: While
arbitrary objects (except month strings) used to be considered less than any
``Month`` instance, such a comparison now raises a ``TypeError``.

- Removed deprecated ``Month.isBetween`` method.

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- Support Python 2.7 and PyPy only.

- Add tox as testrunner.

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- Add a ``__len__`` method to `MonthInterval`.

- Require `z3c.form >= 2.6` to get rid of some odd test dependencies.

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- Fix `configure.zcml` to include needed `meta.zcml` files.