Commando

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Thanks to `Julien Danjou`_ :

- Add support for nested sub commands.
{0e26a6fe2571accb78d26318ab1b8dc65636d2b0}. (Pull 7)

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Thanks to `Ben West`_ :

- Allow commands to have no params.

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- Bundle various frequently used utilities with commando.
(``ShellCommand``, ``ConfigDict``, ``autoprop`` and logging helpers).
{63525646bb366f4def3c5065a51a404b18269873}. (Pull 4)

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- Commando must consume exceptions by default. Any exception should be
communicated in a friendly manner to the user via the parser or the
given logger. {0e26a6fe2571accb78d26318ab1b8dc65636d2b0}.

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Thanks to `Brandon Philips`_ :

- Use ``distribute_setup.py``.
- Derive version from ``pkg_resources``.
- Add ``argparse`` as a dependency.

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- Add more decorators that map to argparse parameters.