Zope-annotation

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- Don't make AttributeAnnotations available as a view.

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- Add ``__bool__`` method to ``IAnnotations`` API for Python 3 compatibility.

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- Add `tox.ini`.

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- Add support for Python 3.3 and PyPy.

- 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.

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

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- Add ZODB3 to install_requires, because it's a true requirement of this
package, not just a testing requirement, as BTrees are in use.

- Fix one test that was inactive because it's function was overriden by
a mistake.

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- Clean up package description and documentation a bit.

- Change mailing list address to zope-dev at zope.org, as
zope3-dev at zope.org is now retired.

- Remove old zpkg-related files.