Use cls passed so people can override Request. Closes #107.

Author: joestump

oauth2/__init__.py

@@ -569,8 +569,8 @@ def from_consumer_and_token(cls, consumer, token=None,
             if token.verifier:
                 parameters['oauth_verifier'] = token.verifier
 
-        return Request(http_method, http_url, parameters, body=body, 
-                       is_form_encoded=is_form_encoded)
+        return cls(http_method, http_url, parameters, body=body, 
+            is_form_encoded=is_form_encoded)
 
     @classmethod
     def from_token_and_callback(cls, token, callback=None,