Testfixtures

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- Fix for use with PyPy, broken since 4.8.0.

Thanks to Nicola Iarocci for the pull request to fix.

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- Added the `suffix` parameter to :func:`compare` to allow failure messages
to include some additional context.

- Update package metadata to indicate Python 3.5 compatibility.

Thanks for Felix Yan for the metadata patch.

Thanks to Wim Glenn for the suffix patch.

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- Introduce a new :class:`Replace` context manager and make :class:`Replacer`
callable. This gives more succinct and easy to read mocking code.

- Add :class:`ShouldWarn` and :class:`ShouldNotWarn` context managers.

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- Add the ability to pass ``raises=False`` to :func:`compare` to just get
the resulting message back rather than having an exception raised.

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- Fix a bug that mean symlinked directories would never show up when using
:meth:`TempDirectory.compare` and friends.

- Add the ``followlinks`` parameter to :meth:`TempDirectory.compare` to
indicate that symlinked or hard linked directories should be recursed into
when using ``recursive=True``.

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- Switch from ``cStringIO`` to ``StringIO`` in :class:`OutputCapture`
to better handle unicode being written to `stdout` or `stderr`.

Thanks to "tell-k" for the patch.