Doctor

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- First beta release of 3.0. This is a backwards incompatible change. It drops
support for python 2 and defining request parameters through the usage of json
schemas. It's still possible to use the json schemas from previous versions
of doctor to generate new doctor types using doctor.types.json_schema_type.
See the documentation for more information.

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- Added status_code to Response class.

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- Fixed a few deprecation warnings about inspect.getargspec when running
doctor using python 3. It will now use inspect.getfullargspec. This
also fixes the issue of not being able to use type hints on logic functions
in python 3.

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- Removed set operation on decorators when applying them to the logic function.
Since set types don't have an explicit order it caused unpredicatable
behavior as the decorators weren't always applied to the logic function
in the same order with every call.

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- Add request option to router HTTP method dictionary, which allows you to
override the schema used to validate the request body.

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- Fixed response validation when the response was an instance of
doctor.response.Response