Testfixtures

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- Fixed compatibility with Python 2.5

- Fixed compatibility with Python 2.7

- Development model moved to continuous integration using Jenkins.

- Introduced `Tox`__ based testing to ensure packaging and
dependencies are as expected.

__ http://tox.testrun.org/latest/

- 100% line and branch coverage with tests.

- Mark :any:`test_datetime <mock_datetime>` , :class:`test_date <mock_date>` and
:class:`test_time <mock_time>` such that nose doesn't mistake them as tests.

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- Fixed a bug where when a target was replaced more than once using a
single :class:`Replacer`, :meth:`~Replacer.restore` would not
correctly restore the original.

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- Fixed a bug where attributes and keys could not be
removed by a :class:`Replacer` as described in
:ref:`removing_attr_and_item` if the attribute or key might not be
there, such as where a test wants to ensure an ``os.environ``
variable is not set.

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- Move to use `nose <http://readthedocs.org/docs/nose/>`__ for running
the testfixtures unit tests.

- Fixed a bug where :meth:`~testfixtures.datetime.MockDateTime.now` returned an instance of the
wrong type when `tzinfo` was passed in
:ref:`strict mode <strict-dates-and-times>`.

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- :class:`Replacer`, :class:`TempDirectory`, :class:`LogCapture` and
``TestComponents`` instances will now warn if the
process they are created in exits without them being cleaned
up. Instances of these classes should be cleaned up at the end of
each test and these warnings serve to point to a cause for possible
mysterious failures elsewhere.

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- Add a :ref:`strict mode <strict-dates-and-times>` to
:any:`test_datetime <mock_datetime>` and :class:`test_date <mock_date>`.
When used, instances returned from the mocks are instances of those
mocks. The default behaviour is now to return instances of the real
:class:`~datetime.datetime` and :class:`~datetime.date` classes
instead, which is usually much more useful.