WebSocket.send fix for big data

on slow internet connections the send command fails sometimes to send all the data in one packet. then the websocket connection is out of sync and get's interrupted.

websocket.py

@@ -518,7 +518,9 @@ class WebSocket(object):
         if self.get_mask_key:
             frame.get_mask_key = self.get_mask_key
         data = frame.format()
-        self.io_sock.send(data)
+        while data:
+            l = self.io_sock.send(data)
+            data = data[l:]
         if traceEnabled:
             logger.debug("send: " + repr(data))