Load test data with pyspark

[lukewendling]

Use Spark 2.0 docker containers (1 master/ 1 slave) to encapsulate a simple py script that loads data directly into mongo (loopy not a good candidate) for ingesting fairly large datasets (> 10M posts).

[drJAGartner]

I looked over what you had, please commit and we should be good.

[lukewendling]

accidentally merged to 88 branch after it was itself merged to another. let's leave it in 88 branch for later use, if needed.