Testfixtures

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- Add support for non-deterministic logging order when using :meth:`twisted.LogCapture`.

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- Fix for using :func:`compare` to compare two-element :func:`~unittest.mock.call`
objects.

Thanks to Daniel Fortunov for the fix.

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- Allow any attributes that need to be ignored to be specified directly when calling
:func:`~testfixtures.comparison.compare_object`. This is handy when writing
comparers for :func:`compare`.

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- Fix a bug that occured when using :func:`compare` to compare a string with a
slotted object that had the same :func:`repr` as the string.

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- Add support for ``universal_newlines``, ``text``, ``encoding`` and ``errors`` to
:class:`popen.MockPopen`, but only for Python 3.

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- :class:`decimal.Decimal` now has better representation when :func:`compare` displays a failed
comparison, particularly on Python 2.

- Add support to :func:`compare` for explicitly naming objects to be compared as ``x`` and ``y``.
This allows symmetry with the ``x_label`` and ``y_label`` parameters that are now documented.

- Restore ability for :class:`Comparison` to compare properties and methods, although these uses
are not recommended.

Thanks to Daniel Fortunov for all of the above.