Gocept-testing

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- Fixed documentation and faulty 1.5 release.

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- Add ``.patch.Dict``, a dict patching context manager.

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- Add ``TempDir`` fixture.
- Add ``assertStartsWith``, ``assertEndsWith``.

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- Allow ``assertEllipsis`` to work with mixed unicode/bytes argument
(assuming the bytes are UTF-8, as they are with zope.testbrowser).

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- Display original traceback in ``assertNothingRaised``.

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- Add patch helper for attributes and simple callables.