Rotate-backups

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Bug fix: Guard against empty rotation schemes.

.. _Release 2.1: https://github.com/xolox/python-rotate-backups/compare/2.0...2.1

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Backwards incompatible: Implement a new Python API.

The idea is that this restructuring will make it easier to re-use (parts of)
the `rotate-backups` package in my other Python projects..

.. _Release 2.0: https://github.com/xolox/python-rotate-backups/compare/1.1...2.0

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Merged pull request `1`_: Add include/exclude filters.

I made significant changes while merging this (e.g. the short option for
the include list and the use of shell patterns using the fnmatch module)
and I added tests to verify the behavior of the include/exclude logic.

.. _Release 1.1: https://github.com/xolox/python-rotate-backups/compare/1.0...1.1
.. _1: https://github.com/xolox/python-rotate-backups/pull/1

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- Started working on a proper test suite.
- Split the command line interface from the Python API.
- Prepare for API documentation on Read The Docs.
- Switch from ``py_modules=[...]`` to ``packages=find_packages()`` in ``setup.py``.

.. _Release 1.0: https://github.com/xolox/python-rotate-backups/compare/0.1.2...1.0

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- Bug fix for ``-y``, ``--yearly`` command line option mapping.
- Fixed some typos (in the README and a comment in ``setup.py``).

.. _Release 0.1.2: https://github.com/xolox/python-rotate-backups/compare/0.1.1...0.1.2

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- Added missing dependency.
- Removed Sphinx-isms from README (PyPI doesn't like it, falls back to plain text).

.. _Release 0.1.1: https://github.com/xolox/python-rotate-backups/compare/0.1...0.1.1