Gocept.webtoken

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- Fix `extract_token` to accept any ``collections.Mapping`` derived object.

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- Added helper functions to create a Bearer Authorization header and extract
a token from it.

- Officially support Python 3.5.

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- Shortened imports for `CryptographicKeys`, `create_web_token` and
`decode_web_token`, which are now importable directly from `gocept.webtoken`.

- Added documentation.

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* Add support for Python 3.3 and 3.4.

* Initial release, extracted from internally used package.