Moauthlib

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* (FIX) Normalize handling of request.scopes list

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* (New Feature) **OpenID** support.
* Documentation improvements and fixes.

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* (Fix) Query strings should be able to include colons.
* (Fix) Cast body to a string to ensure that we can perform a regex substitution on it.

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* (Enhancement) Better sanitisation of Request objects __repr__.

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* (Fix) '(', ')', '/' and '?' are now safe characters in url encoded strings.
* (Enhancement) Added support for specifying if refresh tokens should be created on authorization code grants.
* (Fix) OAuth2Token now handles None scopes correctly.
* (Fix) Request token is now available for OAuth 1.
* (Enhancement) OAuth2Token is declared with __slots__ for smaller memory footprint.
* (Enhancement) RefreshTokenGrant now allows to set issue_new_refresh_tokens.
* Documentation improvements and fixes.

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* (Fix) Changed the documented return type of the invalidate_request_token() method from the RSA key to None since nobody is using the return type.
* (Enhancement) Added a validator log that will store what the endpoint has computed for debugging and logging purposes (OAuth 1 only for now).