+cam #3885 Add the ability to use an external camel context
=doc document why Deliver takes an ActorPath
=per #3898 Increase expect timeout for SharedLeveldbJournalSpec
=rem #3787: Fix wrong loglevels in remote events logging (forward port)
!act,doc #3831 Adding more Java with Lambda documentation and support

* The Java with Lambda support documentation for AbstractActor and AbstractFSM are now on par with Scala
* Many small fixes and additions of missing things
* Added an AbstractActorContext that has convenience functions for getChild and getChildren
Merge pull request #2051 from akka/wip-3831-java-8-doc-ban

!act,doc #3831 Adding more Java with Lambda documentation and support
+act #3900 make systemActorOf available to Extensions
=rem #3902: Reduce disassociate errors in remote stress-test
=pro #3904 do not leak internal repositories during staging
=pro Fixed release script Java version check
Merge pull request #2055 from akka/wip-fix-java-version-in-release-script-master-ban

 =pro Fixed release script Java version check
Merge pull request #2052 from akka/wip-3900-systemActorOf-∂π

+act #3900 make systemActorOf available to Extensions
Merge pull request #2045 from akka/wip-pomIncludeRepositories-∂π

=pro #3904 do not leak internal repositories during staging
Merge pull request #2049 from drewhk/wip-3787-loglevel-fix-forwardport-drewhk

=rem #3787: Fix wrong loglevels in remote events logging
Merge pull request #2044 from krasserm/wip-3898-increase-expect-timeout-krasserm

=per #3898 Increase expect timeout for SharedLeveldbJournalSpec
Merge pull request #2040 from akka/wip-persistent-delivery-path-∂π

=doc document why Deliver takes an ActorPath
Merge pull request #2053 from drewhk/wip-3902-reduce-drop-in-stresstest-drewhk

=rem #3902: Reduce disassociate errors in remote stress-test
=doc Fixed typos in actor documentation
+per #3906 add Java8 support for Persistence

- Provided new interfaces for akka-persistence to be usable directly
  through ReceiveBuilder/PartialFunction. Added a sample java project to
  showcase the usage of these API's with akka-persistence.
- Fixed a minor comment block in javadoc code snippet.
- Renamed java event persistor and fixed a documentation typo.
- Put back java event persistence methods in
  UntypedEventsourcedProcessor and copied them into
  AbstractEventsourcedProcessor for the sake of clarity in javadocs.
  Also corrected some doc punctuations.
- Documentation for akka-persistence java 8 lambda expressions support.
- Moved code examples referred from within lambda-persistence.rst to
  java8 compatible sample project.
- Removed remaining unwanted java8 compatible source files.
+per #3906 use AbstractActor for Java8 Persistence

- also rename and link doc chapter