Return of the DefaultSystemMessageQueue fixes. See #3170
 #3165 - Preventing SOE with conflicting serializers when serialize-messages = on
 #3166 - Adding parenthesis to FSM.initialize
Merge pull request #1276 from akka/wip-3170-deadlock-in-calling-thread-dispatcher-ban

Return of the DefaultSystemMessageQueue fixes. #3170
Correctly serialize local actor refs from other actor systems. See #3137
Cleaning up the ActorRef serialization according to review. See #3137
Merge pull request #1272 from akka/wip-3137-seralize-actor-refs-from-other-systems-ban

Correctly serialize local actor refs from other actor systems #3137
Merge pull request #1288 from akka/wip-3165-prevent-soe-√

 #3165 - Preventing SOE with conflicting serializers when serialize-mess...
Merge pull request #1289 from akka/wip-3166-FSM-initialize-parens-√

 #3166 - Adding parenthesis to FSM.initialize
Merged with master