WIP: introduce Visualizer for rendering in notebooks (#247) - revisited.

[liammagee]

Updates #247 in the following ways:

• Renames ipython.py to JupyterVisualizer.py, and adds some ability to handle dependencies like Chart.js
• Includes a Jupyter notebook example, with a working chart
• Adds a ipywidget slider for fps

Still POC, and willing to help develop further.

[jackiekazil]

This is really exciting and something that has sat on the back burner for awhile after @smacleod's experiment. Adding Steven to the convo, just in case there was some great insight that he had stored in the back of his head.

[jackiekazil]

Hello @liammagee -- It looks like there isn't movement on this in awhile. I really hope you have a chance to finish on this. Looking at the Travis integration, it looks like it failed on this...
https://github.com/projectmesa/mesa/blob/master/CONTRIBUTING.rst#testing-and-code-standards
^^ You can run those commands locally to help you work through those.

For now, I am going to close this PR and track work in ticket #246. Please resubmit when complete OR when you want another pair of eyes again. I really would love to see this added.