Rev gatk-public dependency to 4.alpha.2-63-g13f88ae-20161016.062553-1
Rev gatk-public dependency to 4.alpha.2-63-g13f88ae-20161016.062553-1

This brings in the ploidy bug fix for the HaplotypeCaller

broadinstitute/gatk-protected,broadinstitute/gatk-protected,broadinstitute/gatk-protected,broadinstitute/gatk-protected,broadinstitute/gatk-protected,broadinstitute/gatk-protected