more DCE
a modest optimization for the collection pickler
tag keys are now normalized

that was a nice debugging session tracking the difference between
scala.collection.immutable.:: and scala.::
fixed an issue with final Vertex
Adding java travInt benchmark (task: travIntJava)
Adding kryo travInt benchmark (task: travIntKryo)
Adding java memory travInt benchmark (travIntJavaFreeMem), had to rename scala.testing
Adding kryo memory travInt benchmark (travIntKryoFreeMem)
Adding java size travInt benchmark (travIntJavaSize)
Adding kryo size travInt benchmark (travIntKryoSize)
bench proxies for the core project