Configurator

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- Enable the context manager returned by :meth:`Config.push` to return
the state of a global config object to what it was before :meth:`~Config.push`
was called.

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- Add support for :meth:`pushing <Config.push>` and :meth:`popping <Config.pop>`
config data onto a global :class:`Config`.

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- Support for optional configuration files in :meth:`Config.from_path`.

- Add :meth:`if_supplied` mapping operation.

- Fully documented.

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- Initial release without docs.