Update document on message_receive in _stream_hybi.py. It must describe on binary support.
Update document on message_receive in _stream_hybi.py.
It must describe on binary support.

TBR=tyoshino@chromium.org

Review URL: http://codereview.appspot.com/4978054

git-svn-id: d23f85197b9dafcb1b1682eb9d0eda70517bdc52@546 4ff78f4a-9131-11de-b045-6380ec9940d4

bpsinc-native/src_third_party_pywebsocket_src,bpsinc-native/src_third_party_pywebsocket_src,bpsinc-native/src_third_party_pywebsocket_src,bpsinc-native/src_third_party_pywebsocket_src