Zope.principalannotation

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- Replace use of long-deprecated ``zope.testing.doctest`` with stdlib's
``doctest``.

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- Accomodate new methods added to ``zope.annotation.interfaces.IAnnotations``
in upcoming zope.annotation 4.4.0 release.

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- Add support for PyPy.

- Add support for Python 3.4.

- Add support for testing on Travis.

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- Correct Trove classifiers.

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

- Add support for Python 3.3.

- 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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- Fix a test failure in nested local site manager setup.

- Remove dependency on zope.container.