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