Create Visualize class for generating GeoML output graphics

[tnigon]

After new predictions are made, it is helpful to visualize the results to share with the customer. The goal with the Visualize class is to have a class that takes any of the data made available from Predict to use in plotting/visualization functions. I'm sure this will have to be thought out further as we get into it because currently all predictions are mostly stored to local file directories rather than stored to memory in the Predict class.

To be included is v. 0.0.2

To do:

• 1. Create Visualize class in GeoML.
• 2. agvise_mimic() function to create line plot of observed and predicted values.