Bumped Spark version to 1.6.1
Bumped Spark version to 1.6.1

tdanford/adam,erictu/adam,tdanford/adam,erictu/adam,laserson/adam,laserson/adam,tdanford/adam,laserson/adam,heuermh/adam,massie/adam,massie/adam,heuermh/adam,massie/adam,bigdatagenomics/adam,erictu/adam,bigdatagenomics/adam,massie/adam,bigdatagenomics/adam,erictu/adam,laserson/adam,heuermh/adam,heuermh/adam,bigdatagenomics/adam,tdanford/adam