added dependency to akka-stream, as per http://akka.io/blog/news/2017/05/03/akka-http-10.0.6-released#compatibility-notes, to use akka-actor and akka-http together (#2580)
added dependency to akka-stream, as per http://akka.io/blog/news/2017/05/03/akka-http-10.0.6-released#compatibility-notes, to use akka-actor and akka-http together (#2580)


broadinstitute/cromwell,broadinstitute/cromwell,broadinstitute/cromwell,ohsu-comp-bio/cromwell,broadinstitute/cromwell,ohsu-comp-bio/cromwell,ohsu-comp-bio/cromwell,broadinstitute/cromwell