streaming visualization static on public server

So I was following the **Streaming Line** example at this [link](http://lightning-viz.org/visualizations/streaming/)

It works locally (flying by pretty fast though so I have to put a `time.sleep(2)` after each append to the viz. 

However it doesn't work for the public server (i.e., http://public.lightning-viz.org/) and the image is static.

How do we solve this?
