Prettyconf

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- Fix a bad behaviour that make impossible to define a None default

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- Make config.{cast} shortcuts easier to use. This change breaks backward compatibility.

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- Fix an issue with .env parser that breaks with unquoted URL values
- Fix an issue with magic _get_path used by config discovery (thanks bertonha)

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- Add basic documentation

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- Fix a small issue in README.txt formatting

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- First version