RandomKiller actor implementation

RandomKiller implementation
A simple 'Godfather' actor that acts as a parent for all Phenotypes

Note:
We should use `src/it/scala` for integration test but I wasn't able to configure this withing the ScalagenBuild file (It doesn't mark the `src/it/scala` as sources root). More about integration tests: http://www.scala-sbt.org/release/docs/Detailed-Topics/Testing#integration-tests