- it is customary to use class name for categorizing logs, hence we
should support it; class is taken from logSource.getClass
- update SLF4J module to use logClass as category and set logSource in
MDC "akkaSource"
- add docs
* 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