Updates per recent data and runtime environment changes.

Now using [Google Genomics Public](https://cloud.google.com/genomics/data/1000-genomes) data from @cassiedoll and [Click-to-deploy Hadoop](https://cloud.google.com/solutions/hadoop/click-to-deploy) on Google Compute Engine from @mbookman

Simplified setup instructions per recent change by @elmer-garduno to propagate auth to worker.