Add example using predict_contributions to the MOJO quick start

Description

The MOJO Quick Start shows how to get leaf node assignments. http://docs.h2o.ai/h2o/latest-stable/h2o-docs/productionizing.html#mojo-quickstart

Also include an example of obtaining the Shapley values for GBM.

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Assignee

Angela Bartz

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Reporter

Angela Bartz

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