Zope.session

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- Add support for Python 3.5 and 3.6.

- Drop support for Python 2.6 and 3.3

- Reach 100% code coverage and maintain it via tox.ini and Travis CI.

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- Add support for PyPy and PyPy3.

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- Add support for Python 3.4.

- Add support for testing on Travis.

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- Fix test that fails on any timezone east of GMT

====================

- Add support for Python 3.3

- Replace deprecated ``zope.component.adapts`` usage with equivalent
``zope.component.adapter`` decorator.

- Replace deprecated ``zope.interface.implements`` usage with equivalent
``zope.interface.implementer`` decorator.

- Drop support for Python 2.4 and 2.5.

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- LP 824355: enable support for HttpOnly cookies.

- Fix a bug in ``zope.session.session.Session`` that would trigger an
infinite loop if either iteration or a containment test were
attempted on an instance.