generate convergence plot from monitor stream

[mmckerns]

generate convergence plot from monitor stream (as a function call)

[mmckerns]

At the most basic, the following is required:

def plot_param(monitor):
    x = range(len(monitor.y))
    y = monitor.x
    pylab.plot(x,y)
    return

def plot_cost(monitor):
    x = range(len(monitor.y))
    y = monitor.y
    pylab.plot(x,y)
    return

It would be nice to be able to use subplots to (optionally) show both of the above plots at once. Also, the features available in the plotting scripts should be implemented.

[mmckerns]

some initial work on this in r736