Commando

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- Fix code formatting issues.
- Add travis.yml.

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Thanks to `Jon Banafato`_:

- Install with setuptools instead of distribute.
- Python 3 compatibility.

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- Use proper error code on exit.

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- Fix exception handling.
- Never use `__parser__.error`
- Always log errors and traceback
- Add wrapper methods for `__parser__`.
- `exit`, `error`
- `print_usage, `print_help`
- `format_usage, `format_help`
- Improve docstrings.

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- Add `load_python_object` to load a python object using a qualified name.

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Thanks to `fruch`_ :

- Preserve the order of parameters in declaration.