Streamling plot options

[gshotwell]

We implemented a streaming plotly decorator as part of the model_score example. This is a great feature because it makes plot updating much faster and more fluid. It would be great if we could do two things:

1. Add a @render.plotly decorator which did a better job at rendering plotly than our current implementation (see Plotly widget sizing issue within rows #620). This could have a streaming or in_place argument to trigger the streaming behaviour.
2. Investigate whether something similar would work for matplotlib plots