Swagger from file

[ninit]

Hi,

This is a proposal to decode a special line in a docstring swagger_from_file: path.

I think it could be useful sometimes to take the yaml swagger spec out of the docstring:

• if you have other things to say in the docstring,
• if it's easier to edit yaml code from a .yml file.

In the pull request you'll find besides flask_swagger.py a modified example and README.md

Please criticize as needed. Thanks.

[atlithorn]

Otherwise looks good and thanks for contributing!

[ninit]

Thanks for your review. You're right, it's better to leave this off by default. I've just committed the change.