Adding high-performance MPSC queue based mailbox to Akka
Drop unserializable and oversized messages, preserving association. Fixes #3070
Return of the DefaultSystemMessageQueue fixes. See #3170
NPE in logFailure, see #3181
Merge pull request #1279 from akka/wip-3181-npe-faulthandling-patriknw

NPE in logFailure, see #3181
Merge pull request #1269 from akka/wip-3070-drop-association-rich

Drop unserializable and oversized messages, preserving association. Fixes #3070
 #3018 - Enabling -Xlint and dealing with the situation that occurs
Making SerializedSuspendableExecutionContext use AbstractNodeQueue instead of ConcurrentLinkedQueue
Merge with master
 #3165 - Preventing SOE with conflicting serializers when serialize-messages = on
 #3166 - Adding parenthesis to FSM.initialize
Link to old migration guides instead of embedding, see #2774

* Otherwise the embedded old migration guide might have wrong
  version variable replacements (scala, config lib) when changed
  versions are changed in master
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
Merge pull request #1282 from akka/wip-3018-enable-xlint-√

 #3018 - Enabling -Xlint and dealing with the situation that occurs