Don't send \r characters in zmqshell clear_ourput

IPython/html/static/notebook/js/outputarea.js

@@ -274,9 +274,6 b' var IPython = (function (IPython) {'
         
         // validate output data types
         json = this.validate_output(json);
-        // TODO: Why are we recieving these new line characters for no 
-        // reason?  They ruin everything.
-        if (json.output_type === 'stream' && !json.text.trim()) return;
 
         // Clear the output if clear is queued.
         var needs_height_reset = false;

IPython/kernel/zmq/zmqshell.py

@@ -90,11 +90,7 b' class ZMQDisplayPublisher(DisplayPublisher):'
 
     def clear_output(self, wait=False):
         content = dict(wait=wait)
-
-        print('\r', file=sys.stdout, end='')
-        print('\r', file=sys.stderr, end='')
         self._flush_streams()
-        
         self.session.send(
             self.pub_socket, u'clear_output', content,
             parent=self.parent_header, ident=self.topic,