Fix TestClient.test_access_token_post test

Look for oauth_token instead of oauth_token_key in content

Fixes simplegeo/python-oauth2 Issue joestump#3

Author: dougireton

tests/test_oauth.py

@@ -719,7 +719,7 @@ def test_access_token_post(self):
         self.assertEquals(int(resp['status']), 200)
 
         res = dict(parse_qsl(content))
-        self.assertTrue('oauth_token_key' in res)
+        self.assertTrue('oauth_token' in res)
         self.assertTrue('oauth_token_secret' in res)
 
     def _two_legged(self, method):