Zope.exceptions

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- Automated build of Sphinx HTML docs and running doctest snippets via tox.

- Added Sphinx documentation.

- Added support for continuous integration using ``tox`` and ``jenkins``.

- Removed use of '2to3' and associated fixers when installing under Py3k.
The code is now in a "compatible subset" which supports Python 2.6, 2.7,
and 3.2, including PyPy 1.8 (the version compatible with the 2.7 language
spec).

- 100% unit test coverage.

- Dropped explicit support for Python 2.4 / 2.5 / 3.1.

- Added 'setup.py dev' alias (runs ``setup.py develop`` plus installs
``nose`` and ``coverage``).

- Added 'setup.py docs' alias (installs ``Sphinx`` and dependencies).

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- Fix: missed to reverse extractStack entries

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- Added TextExceptionFormatter.extractStack and extract_stack

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- Fallback to traceback.format_tb when the formatter is called recursively.
i.e. Don't let errors in the formatter pass silently.

- Fix deprecated unittest functions: ``assert_`` and ``assertEquals``.

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- Fixed tests to work under Python 2.7.

- PEP8 cleanup and removed obsolete build infrastructure files.

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- Added support to bootstrap on Jython.

- Added Python 3 support.

- The dependency on zope.testing seemed spurious, possibly a rest of a real
dependency that is gone now. I removed it.