Adds config.SWAGGER_PREAUTHORIZEAPIKEY key

[yweber]

Solution proposal for #196

This configuration key is designed to contain a function returning

• False if no preauthorization needed/wanted
• A tuple(authorization_name, key) if preauthorization wanted

The documentation is updated too.

[codecov[bot]]

Codecov Report

Merging #197 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #197   +/-   ##
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  Coverage   96.92%   96.92%           
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  Files          19       19           
  Lines        2697     2697           
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  Hits         2614     2614           
  Misses         83       83           

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