Spark Testing Base new version and g8 template for Spark!

My yak shaving today lead me to release a new version of spark-testing-base (0.7.0) base with 2.1.1 support and improved python support as well as a g8 template for Spark projects so you don't always have to copy that build file from the last one and tweak it a bit.

 On happy notes, RC6 for Spark 2.2 also passed today so I'll be publishing a new version of spark-testing-base next week after the release is finished.

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