8.5 - Supervision and DeathWatch
println cleanup Pilots.scala
8.6 - Dead Pilots
8.6 - Dead pilots - AutoPilot Extra
PilotsSpec fix
9.2 - The stateful flight attendant
9.3 - A better flyer (Heading Indicator)
9.3 - A better flyer (FlyingBehaviour FSM)
9.4 - The Naughty Pilot