Conflicts:
akka-actor/src/test/scala/akka/dispatch/ActorModelSpec.scala
project/build/AkkaProject.scala
both resolved by "union" approach
- change wavesOfActors test for CTD: scheduling SHUTDOWN 10000 times does not
work so well...
- add executeFuture with trivial implementation, TBC
Up to now it relied on the ActorRef's lock, but that has the side effect that a
large time may pass between the suspend test and the actual execution. With
this lock in place, the ActorRef lock should never block and the time between
suspend and the last actor execution is shortened to some cycles (modulo GC).
dispatcherShouldHandleQueueingFromMultipleThreads tests for possible race
conditions in prohibiting multiple threads running the same actor concurrently
