incorporate htsjdk 2.13.1 (#1007)
incorporate htsjdk 2.13.1 (#1007)

this includes a critical fix for every tool that uses a sorting collection
fixes #1000 
broadinstitute/picard,alecw/picard,alecw/picard,broadinstitute/picard,broadinstitute/picard,alecw/picard,broadinstitute/picard,alecw/picard,broadinstitute/picard