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**Added**
- 301 redirects result in a ``Redirect`` exception.
- :class:`Requestor` is now initialized with a ``timeout`` parameter.
- :class:`ScriptAuthorizer`, :class:`ReadOnlyAuthorizer`, and
:class:`DeviceIDAuthorizer` have a new parameter, ``scopes``, which determines the
scope of access requests.
- Retry 408 "Request Timeout" HTTP responses.