DOC: how to change default mailbox, see #3483
DOC: FSM start state in preStart/postRestart, see #3440
Adjust dist README, see #3105
Handle null constructor parameters, see #3486
=actor: More descriptive error message when serializer with given ID is missing #3487
Fix scaladoc warnings in akka-actor, see #3152

* also change wrong visibility of SystemMessage subclasses
Improve scaladoc in akka-actor, see #3152

* also change visibility of Actor.context
clarify wording of actor termination phase
DOC: Fix compilation error in migration guide
Merge pull request #1603 from akka/wip-termination-wording-∂π

clarify wording of actor termination phase
Merge pull request #1593 from drewhk/wip-3487-better-msg-for-missing-serializerid-drewhk

=actor: Better error message when serializer with given ID is missing #3487
Merge pull request #1592 from akka/wip-3486-null-constructor-param-patriknw

Handle null constructor parameters, see #3486
Merge pull request #1595 from akka/wip-3483-default-mailbox-patriknw

DOC: how to change default mailbox, see #3483
Merge pull request #1596 from akka/wip-3440-fsm-start-patriknw

DOC: FSM start state in preStart/postRestart, see #3440
Merge pull request #1598 from akka/wip-3105-dist-readme-patriknw

Adjust dist README, see #3105
Merge pull request #1602 from akka/wip-3152-scaladoc-patriknw

Improve ScalaDoc/JavaDoc, see #3152
=act:3478 don’t fail constructor at end of hierarchy stress

- also increase the overall test timeout by 20sec to make it more stable
  on slower (but still normal) hardware
=act:3152 Add doc to LoggingAdapter
Merge pull request #1606 from akka/wip-3478-failConstr-∂π

=act:3478 don’t fail constructor at end of hierarchy stress
=clu:3152 Improve scaladoc of cluster