Quarantine from ClusterRemoteWatcher also, see #2993

* This was an oversight in previous pull request
Merge pull request #1344 from akka/wip-quarantining-in-ClusterRemoteWatcher-patriknw

Quarantine from ClusterRemoteWatcher also, see #2993
Temp workaround in tests for the duplicate MemberUp events, see #3239
Merge pull request #1345 from akka/wip-3239-cluster-sample-failures-patriknw

Temp workaround in tests for the duplicate MemberUp events, see #3239
 #3182 - Fixing a StackOverflow error in the FileBasedMailbox
Change member prio for Joining/Up, see #3239

* Sometimes caused duplicate MemberUp events, after conflicting gossips
Only quarantine removed member that was unreachable, see #2594

* For graceful leaving and remove it should still be possible to
  communicate with the node after cluster removal.
* Otherwise the hand over in cluster singleton would break, for
  example.
* Also, skip selfAddress to avoid generation of AddressTerminated
  for the own node when removed from cluster.
Merge pull request #1348 from akka/wip-3229-member-prio-patriknw

Change member prio for Joining/Up, see #3239
NewRemoteActorSpec is racy, but has to work even if the race happens

 - timeout of the test was small, needs time for FD to trigger
Hooked in quarantining
add SslTlsSupport (ported from spray-io), see #3236

- also added TcpPipelineHandler for wrapping a pipeline
- added Java & Scala docs with a complete example
- test verify interop with standard blocking java SSL client and server
- test is placed in akka-remote to benefit from AkkaProvider for
  SecureRandom; should be moved into akka-actor eventually
Merge pull request #1349 from akka/wip-2594-quarantine-removed-member-patriknw

Only quarantine removed member that was unreachable, see #2594
Merge pull request #1347 from akka/wip-3182-fix-SO-in-file-based-mailbox-√

 #3182 - Fixing a StackOverflow error in the FileBasedMailbox
Merge pull request #1350 from drewhk/wip-3249-newremoteactor-failed-drewhk

NewRemoteActorSpec is racy, but has to work even if the race happens
Fixed review comments

 - Using Duration.Undefined
 - Quarantine message is actually handled ;)
Fixed require statement for QuarantineDuration
add link to ticket from FIXME
Merge pull request #1351 from akka/wip-3236-SslTlsSupport-∂π

add SslTlsSupport (ported from spray-io), see #3236
Quarantine is in wrong block
restructure ToC of reST docs

- completely decouple Java/Scala and remove heading suffixes
- move all images into images/
- move cluster docs into “official” place