pluggable API specification generator (common documentation)

 This package contains a pluggable API specification generator. It currently
 supports the OpenAPI Specification (f.k.a. the Swagger specification).
 The features are:
    - Supports the OpenAPI Specification (versions 2 and 3)
    - Framework-agnostic
    - Built-in support for marshmallow
    - Utilities for parsing docstrings
 .
 This is the common documentation package.