For M 4/20

Here's the Colab notebook: https://colab.research.google.com/drive/1_L5MxrzxuPae31E8tbsDQifaUOMe2kA4

We'll be looking at Step II of the classification project, preparing the data.

The project overview is here: http://dataviz.shortell.nyc/sites/dataviz.shortell.nyc/files/Classificat...