Prepare for release 1.15
Prepare for release 1.15

annkupi/picard,broadinstitute/picard,alecw/picard,broadinstitute/picard,alecw/picard,annkupi/picard,broadinstitute/picard,broadinstitute/picard,nh13/picard,alecw/picard,alecw/picard,nh13/picard,nh13/picard,annkupi/picard,annkupi/picard,broadinstitute/picard,nh13/picard