Merge pull request #50 from jeffswartz/issue-47

This fixes #47

Author: jeffswartz

README.rst

@@ -57,8 +57,11 @@ as a database).
   # Create a session that attempts to send streams directly between clients (falling back
   # to use the OpenTok TURN server to relay streams if the clients cannot connect):
   session = opentok.create_session()
+
+  from opentok import MediaModes
   # A session that uses the OpenTok Media Router:
   session = opentok.create_session(media_mode=MediaModes.routed)
+
   # A session with a location hint
   session = opentok.create_session(location=u'12.34.56.78')