Zope-tales

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- Remove hard dependency on ``zope.tal``, which was already conditionalized
but required via ``setup.py``.

- Add support for Python 3.3 and PyPy.

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

- Drop support for Python 2.4 and 2.5.

- Fix documentation link in README.txt

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- Subexpressions of a 'string:' expression can be only path expressions.
https://bugs.launchpad.net/zope.tales/+bug/1002242

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- Remove use of ``zope.testing.doctestunit`` in favor of stdlib's 'doctest.

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- Port the lazy expression from ``Products.PageTemplates``.

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- Update package setup.

- Initial release outside the Zope 3 trunk.

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- Corresponds to the verison of the zope.tales package shipped as part of
the Zope 3.2.0 release.

- Documentation / test fixes.