Opster

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- Drop Python 2 support

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- When function arguments (which become command line options) had underscores
in them, they appeared in help as unnamed argument (GH-60_). No more.

.. _GH-60: https://github.com/piranha/opster/issues/60

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- Improve guessing abilities under Python 3 (options in keyword arguments and
keyword only arguments are combined now).

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- Infinitely `nested subcommands`_.
- Tuple options (one of given enumerated values).
- A lot of fixes.

Most of changes were done by `Oscar Benjamin`_.

.. _nested subcommands: http://opster.readthedocs.org/en/latest/overview.html#nested-subcommands

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- Fixed name in usage on Windows.
- Improved and documented preparsing of global options when using subcommands (GH-25).

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- Now commands can have ``-h`` option (GH-2).
- Better Windows compatibility (GH-18, GH-20).
- Refactored internal options representation with easier introspectability
(GH-19).
- Tests support Python 3 (GH-21).

Thanks for this release are going to `Oscar Benjamin`_, every point in this
release is his work.

.. _Oscar Benjamin: https://github.com/oscarbenjamin