copy p5 to here so that all udacity projects in one place

talk more about the strategy

answer first two questions to get feedback from udacity

implemented reviewer suggestions

finished project 4 - training a smartcab

replaced talk about "dry" and "refrigerated" signals in ICA as they are

- added some histograms of each product type for exploratory data

fixed pdf version. Was cutoff.

first pass

corrected print value of graduation rate

discussed pros and cons for running grid search multiple times

changed "training feature" to "training label"

prevent peeking into test set

made revisions due to review

run gridsearch multiple times to find best f1 score on test set