Rotate-backups

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Added MacOS compatibility (`6`_):

- Ignore ``stat --format=%m`` failures.
- Don't use ``ionice`` when not available.

.. _Release 4.3: https://github.com/xolox/python-rotate-backups/compare/4.2...4.3
.. _6: https://github.com/xolox/python-rotate-backups/issues/6

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- Document default / alternative rotation algorithms (`2`_, `3`_, `5`_).
- Implement 'minutely' option (`5`_).

.. _Release 4.2: https://github.com/xolox/python-rotate-backups/compare/4.1...4.2
.. _2: https://github.com/xolox/python-rotate-backups/issues/2
.. _3: https://github.com/xolox/python-rotate-backups/issues/3
.. _5: https://github.com/xolox/python-rotate-backups/issues/5

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- Enable choice for newest backup per time slot (`5`_).
- Converted ``RotateBackups`` attributes to properties (I ❤ documentability :-).
- Renamed 'constructor' to 'initializer' where applicable.
- Simplified the ``rotate_backups.cli`` module a bit.

.. _Release 4.1: https://github.com/xolox/python-rotate-backups/compare/4.0...4.1
.. _5: https://github.com/xolox/python-rotate-backups/issues/5

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Added support for concurrent backup rotation.

.. _Release 4.0: https://github.com/xolox/python-rotate-backups/compare/3.5...4.0

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- Use key properties on ``Location`` objects.
- Bring test coverage back up to >= 90%.

.. _Release 3.5: https://github.com/xolox/python-rotate-backups/compare/3.4...3.5

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Added support for expression evaluation for retention periods.

.. _Release 3.4: https://github.com/xolox/python-rotate-backups/compare/3.3...3.4