Rename new_client to new_websocket_client, in order to have a better

name in the SocketServer/HTTPServer request handler hierarchy. Prepare
for merge pull request #72. This work has been picked out of
7b3dd8a6f5 .

tests/test_websocketproxy.py

@@ -124,4 +124,4 @@ class WebSocketProxyTest(unittest.TestCase):
             return ins, outs, excepts
 
         self.stubs.Set(select, 'select', mock_select)
-        self.assertRaises(Exception, web_socket_proxy.new_client)
+        self.assertRaises(Exception, web_socket_proxy.new_websocket_client)