plots to show the progress of the posterior changing with time

[AdityaSavara]

• Create plots that overlay each other
o Only scatter and histogram
 Make these into gifs (actually just a bunch of images then a separate function call to turn those into a gif).
o Make sure plots return fig
 As alternative to gif, Make function that would take in fig and other args to create plots on top of the old plots – use rainbow colors, with default of around 5 intervals (snapshots) during the post-burn-in samples.
o Add incrementor (to track number of series) by adding to namespace like fig.counter = 2
o Make 5 histograms overlayed to show evolution
 Worry about rainbow colored later