Save the rendered html to a file and returns an IFrame to display the plot in the notebook.

def plot_and_save(self,
                      data,
                      w=800,
                      h=420,
                      filename='chart',
                      overwrite=True):
        """Save the rendered html to a file and returns an IFrame to display the plot in the notebook."""
        self.save(data, filename, overwrite)
        return IFrame(filename + '.html', w, h)