Initial implementation of ActorContext, ActorRef, and the #spawn factory.
Improved ActorContext construction.
Merge branch 'master' into actor-context
Ranamed ActorContext#on_restart to #on_reset to avoid confusion.
Added observation and better exception handling to SimpleActorRef.
Merge branch 'master' into actor-context
Removed unnecessary require statement.
Added stopped check in SimpleActorRef#shutdown.
Added deprecation warnings to Actor class.
Merge branch 'master' into actor-context
Merge branch 'master' into actor-context
Added #join method to SimpleActorRef and shared specs.
Removed unimplemented methods from ActorRef.
Merge pull request #48 from jdantonio/actor-context

Initial implementation of ActorContext and the #spawn function