Flask-dance

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Changed
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* "Backends" are now called "Storages", since the word "backend" means
something different in the context of web development. This release
is fully backwards-compatible, but deprecation warnings have been
added anywhere that you import and use a backend (rather than a
storage).

Added
~~~~~
* Add ``oauth_before_login`` signal
* Add ``reprompt_select_account`` parameter to google blueprint

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Added
~~~~~
* Add ``authorization_required`` decorator
* Added Authentiq pre-set configuration

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Added
~~~~~
* Added ``rerequest_declined_permissions`` argument to facebook blueprint
* Added Reddit pre-set configuration

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Added
~~~~~
* Added ``tenant`` argument to ``make_azure_blueprint``
* Added ``hosted_domain`` argument to ``make_google_blueprint``
* Added Okta pre-set configuration
* Added Zoho pre-set configuration

Fixed
~~~~~
* Updated Azure AD default scopes. See `issue 149`_.
* Only set ``auto_refresh_url`` in ``make_google_blueprint`` if a token of
type ``offline`` is requested. See issues `143`_, `144`_ and `161`_ for
background.

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* Flask-Cache is deprecated. Switch to Flask-Caching.
* When using the OAuth 1 blueprint with the SQLAlchemy backend and the
``user_required`` argument set to ``True``, the backend was trying to load
tokens before any were set, causing an exception in the backend.
Now, the backend will not attempt to load tokens until the OAuth dance
is complete.
* Added exception handler around ``parse_authorization_response`` in OAuth1

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* Accessing the ``access_token`` property on an instance of the
``OAuth2Session`` class will now query the token backend, instead of
checking the client on the instance.
* Pre-set configuration for GitLab provider