* Documentation of migration kit
* Documentation of some of the changes
* akka-actor-migration module containing GlobalActorSystem, OldXxx classes and some implicit conversions
* Tried migration of WebWords sample
* Tried migration of akka-samples/async-workers
* Tried migration of akka-samples-trading
* Changed signatures and constructor of MessageDispatcherConfigurator
* Changed Dispatchers.lookup, keep configurators instead of dispatchers
* Removed most of the Dispatchers.newX methods, newDispatcher is still there because of priority mailbox
* How should we make it easy to configure priority mailbox?
* Changed tons tests
* Documentation and ScalaDoc is not updated yet
* Some tests in ActorModelSpec are temporary ignored due to failure