Zope.exceptions

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- Make sure that ``setup.py`` finds all tests. Now tox runs them all as well.

- Fix failing test under Python 3.

- Made buildout work under Python 3 and Buildout 2.

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- Fleshed out PyPI Trove classifiers.

- Fixed a test failure under Python 2.6.

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- Release with a fixed MANIFEST.in (without ``docs/``)

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- Fixed format_exception(..., as_html=True) not to HTML-escape the '<br />'
it adds to the exception value.

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- Test Python 3.3 support under tox.

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- Fixed optional dependency code for `'zope.security`` to work under Python 3.3.