created visualization.py to hold the code needed to handle collapsing, sorting, and visualizing a heatmap_data dict, much of this will be rewritten from what is in heatmaps.py
created visualization.py to hold the code needed to handle collapsing, sorting, and visualizing a heatmap_data dict, much of this will be rewritten from what is in heatmaps.py

CheerfulTeapot/heatmaps,tgbugs/heatmaps,tgbugs/heatmaps,CheerfulTeapot/heatmaps