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* Allow the main API functions to accept a WebOb Request object, a
requests Request object, or a WSGI environ dict as first argument.
This should make it easier to implement client programs.
* macauthlib.sign_request() now returns the Authorization header value, which
is useful if you pass it something immutable as the request to be signed.
* Hide functions from macauthlib.utils that were previously available
directly from macauthlib. This will ensure users import them from the
canonical location.