title: Timeseries streaming in bokeh
body: <p>I want to plot a live time series in bokeh. I want to plot only the new data points at each update. How can I do this ?</p>
  
  <p>There is an example on the bokeh website for animated plots but it involves redrawing the whole picture every time. Also I am looking for a simple example where I can do a live plot of a time series point by point.</p>