Updated all sample datasets to Google Genomics Public Data

For more information see [Google Genomics Public Data](https://cloud.google.com/genomics/public-data).
In the 1,000 Genomes data (both phase1 and phase3) chromosome 17 is '17'.  BUT in the platinum genomes data chromosome 17 is 'chr17'.

Since the default dataset is 1,000 genomes, the default reference should be '17' or else stuff won't work!  :-)