Testfixtures

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- fixed a bug where the replace decorator passed a classmethod
rather than the replacment to the decorated callable when replacing
a classmethod

- added set method to test_date, test_datetime and test_time to allow
setting the parameters for the next instance to be returned.

- added delta and delta_type parameters to test_date,test_datetime and
test_time to control the intervals between returned instances.

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- changed Comparison to use __eq__ and __ne__ instead of the
deprecated __cmp__

- documented that order matters when using Comparisons with objects
that implement __eq__ themselves, such as instances of Django
models.

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- replace and Replacer.replace can now replace attributes that may
not be present, provided the `strict` parameter is passed as False.

- should_raise now catches BaseException rather than Exception so
raising of SystemExit and KeyboardInterrupt can be tested.

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- added support for using TempDirectory, Replacer and LogCapture as
context managers.

- fixed test failure in Python 2.6.

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- fix bug where should_raise didn't complain when no exception
was raised but one was expected.

- clarified that the return of a should_raise call will be None
in the event that an exception is raised but no expected
exception is specified.

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- should_raise now supports methods other than __call__