Adding CSAPR grid quality control notebook!

This is my testing notebook for quality controlling CSAPR grids.
Basically I want to find the best set of thresholds, including the
removal of pixels, i.e. "despeckling". SciPy has some nice image
processing functions (e.g., ndimage.morphology) that should do the job
as far as despeckling is concerned, if I can just figure them out...