Need to build a reference.conf from a bunch of different Akka jars? Here's a simple way to do it from the command line:
for i in /Users/james/nexus/sonatype-work/nexus/storage/central/com/typesafe/akka/*/2.2.1/*jar ; do unzip -q -c $i reference.conf ; done > /tmp/reference.conf
for i in /Users/james/nexus/sonatype-work/nexus/storage/central/com/typesafe/akka/*/2.2.1/*jar ; do unzip -q -c $i reference.conf ; done > /tmp/reference.conf
That just cats together the contents of all the reference.conf files and puts it in /tmp/reference.conf.
Adjust the paths to fit your version and file locations, of course.