text: Title: Autorange values stored in dcc.Graph.figure['layout']['xaxis' 'yaxis']['range'] no longer available after version v0.30.1
  Body: I was using the initial autorange values to "hold" my plotly.graph_objs.Layout plot axes from recalculating when dynamically adding or removing plotly.graph_objs.scatter.Markers.  Three questions:
  
  1. Is there some place else I can read Layout axes range values after they have been calculated by the autorange function?
  2. Is there a better way to "hold" a plotly.graph_objs.Layout to the initial autorange values?
  3. Can the plotly.graph_objs.Layout axes autorange function be invoked directly?