Zope-size

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- Nothing changed yet.

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- Add support for Python 3.5 and 3.6.

- Drop support for Python 2.6, 3.2 and 3.3.

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- Add support for PyPy3.

- Add support for Python 3.4.

- Add support for testing on Travis.

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- Add Trove classifiers indicating CPython and PyPy support.

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

- Drop support for Python 2.4 and 2.5.

- Add support for Python 3.2 and 3.3.

- Conditionally disable tests that require ``zope.configuration`` and
``zope.security``.

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- Include zcml dependencies in configure.zcml, require the necessary packages
via a zcml extra, added tests for zcml.