Merge pull request #29 from anatoliykmetyuk/develop

PingPong example improved
Improved layout of TemplateNode.scala
Improved SubScriptActor.terminate: does not require a threaded code fragment any more, but an event-handling code fragment instead.
Minor improvement to PingPong example
Safe message framework implemented
System ready to remove old ScriptExecutor
Basic decomposition of ScriptExecutor done and tested
Merge pull request #30 from anatoliykmetyuk/develop

Thread interruption exceptions are caught now and don't go to the console
Akka libs rotation
Values in the ScriptExecutors are now public
Template tree refactored
Cosmetic changes
Merge branch 'develop' of https://github.com/AndreVanDelft/scala into develop
Post-merge clean-up