Merge pull request #887 from akka/wip-2732-getDefaultAddress-∂π

add ActorRefProvider.getDefaultAddress, see #2732
Merge pull request #890 from richdougherty/feature-2735-sphinx-install-docs

Updated paths for Sphinx install on Mac OS. Fixes #2735
Merge pull request #896 from akka/wip-2740-resizer-doc-patriknw

Correction of router with resizer doc sample, see #2740
Merge pull request #891 from akka/wip-2736-doc-unhandled-patriknw

Correction of doc of unhandled, see #2736
Merge pull request #884 from akka/wip-2729-√

#2729 - Removing uses of Future.either in favor of firstCompletedOf
Merge pull request #883 from akka/wip-2720-√

#2720 - Adding OSGi manifest to testkit
Merge pull request #885 from akka/wip-2719-√

#2719 - removing deployReadme from Dist task since it isn't used or need...
Merge pull request #878 from akka/wip-2717-√

#2717 - Fixing the backoff strategy in PojoSRTestSupport
 #2718 - Adding version range OSGi importPackage for Protobuf
Don't replace the active connection with a passive one. See #2654
Mark tests that use unstable experimental features as ignored. See #2654

These tests use the throttling in the experimental test conductor which relies
on the fact that the same connection is used for both inbound and outbound
traffic. This is not always the case when starting multiple cluster nodes
at the same time.
Hardening the tests in cluster sample, see #2654
Hardening the tests in cluster sample, see #2654
Cleanup according to comments
Merge pull request #881 from akka/wip-2718-√

#2718 - Adding version range OSGi importPackage for Protobuf
Merge branch 'master' of github.com:akka/akka
fix lookup of top-level’s children, see #2675

- the problem existed only when creating children within the constructor
  of a top-level actor
- add a test which verifies this
introduces new setting for a Bootable to sbt plugin (#2701)

- type is Setting[String]
- defaults to empty String
- is used for generating the start and start.bat scripts
(cherry picked from commit b1a011466052fa0f5ef8ca2ad45e77453381704a)
drop extra space between main class and bootable
(cherry picked from commit a6c6078c58cf16918f8e0c58fe1beb6ed79354c6)
Merge pull request #894 from akka/wip-2724-streamcache-patriknw

Reset StreamCache in getBodyAs to be able to re-read it, see #2724