!act,sam #3889 Adding Activator template FSM/become for Java with Lambda support

* Dining Hakkers Activator template for FSM and become
* Cleaup of FSM event matchers to be more usable and consistent
Merge pull request #2036 from akka/wip-3889-fsm-lambda-activator-ban

!act,sam #3889 Adding Activator template FSM/become for Java with Lambda support