Adds Fault-tolerance

Adds UserGaurdianStrategy
Adds ChildSavingLifecycle
Adds IsolatedLifeCycleSupervisor.
Adds Supervisors
Adds abstract Supervisors
Adding sbt build.properties file.
Converts to ActorSelection
Adds DeathWatch of Pilot to Copilot
Adds DeathWatch of Copilot to Autopilot
Merge pull request #13 from jackcviers/fault-tolerance

Adds Fault-tolerance