+act #3630 - Only fall back to default ctor if NoSuchMethodException
Merge pull request #1846 from akka/wip-3630-serializer-ctor-fallback-√

+act #3630 - Only fall back to default ctor if NoSuchMethodException
!per #3729 Journaling protocol optimization

- internal batching of individually received Persistent messages
- testing fault tolerance of Processor in presence of random
  * journaling failures
  * processing failures
=act #3733 Re-receive unstashed Terminated messages
Merge pull request #1850 from krasserm/wip-3733-re-receive-unstashed-terminated-krasserm

=act #3733 Re-receive unstashed Terminated messages
Merge pull request #1844 from krasserm/wip-3729-journaling-protocol-optimization-krasserm

!per #3729 Journaling protocol optimization
Merge remote-tracking branch: upstream/master