main: return the demand data along with the associated date for new demand data coming in.
test: All unittests now passing.

Let's keep it that way...
prediction: Nuke the PredictionResults class...I hate OOP anyway, no need for more objects.

Move old functionality from PR class to 'Predictor'.

Fix up our 'sanity test' __main__ code to check all of our our 'public' functions.
Add files with our .pickle extension to the Git ignore.
Update notebooks ( particularly the Uber Demand prediction challenge ) to latest form.

UDPC notebook has a ( nearly complete ) writeup for my methodology, plus predictive Artificial NN and AutoRegressive models that I didn't have time to integrate into the DemandPrediction.
Remove old notebooks, update .gitignore