Cluster messaging with path dependent types working, but hacky
Still having a problem with stackoverflowexception
Stackoverflow due to Scala 2.10.0 List serialisation bug.  On 2.10.1-RC1 now.
Big tidy of ABC structure, but new code still in cluster project
Refactor Cluster ABC stuff back into main packages
Merge branch 'oliver' into develop

Conflicts:
	src/main/scala/sampler/run/cluster/Master.scala
	src/main/scala/sampler/run/cluster/Worker.scala
Fix merge mess