Cruds

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Features:
- Initial implmentation of OAuth 2.0 Authorization Grant
- Resource Owner Password Credientals
(`Section 1.3.3 RFC 6749 <https://www.rfc-editor.org/rfc/rfc6749#section-1.3.3>`_)
- Client Credentials
(`Section 1.3.4 RFC 6749 <https://www.rfc-editor.org/rfc/rfc6749#section-1.3.4>`_)
- Refresh tokens will be used if included in the response from the server.
(`Section 1.5 RFC 6749 <https://www.rfc-editor.org/rfc/rfc6749#section-1.5>`_)

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In the CRUDs package, Interfaces can now be generated through YAML Configuration
files. This is for APIs that have many models with common request types.