#3272: Eliminate redundant 'should' in DataflowSpec test
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
do not close over context.self in TickGenerator, see #3393
FIXME in cluster, see #3192
Merge pull request #1375 from mjkrumlauf/master

#3272 - Eliminate redundant "should" in DataflowSpec test output
Remove redundant should/must in tests, see #3272
add supported zeromq version information in docs
fix some FIXMEs, see #3192

- remove some outdated ones (which were already fixed but not removed)
- make socket options fully configurable in NettyTransport
- also apply socket options to outbound connections, not only the listen
  socket
- remove timeout from taking the lock in RepointableActorRef, because we
  cannot afford to lose system messages anymore, so we should rather
  block the sender
Split mailbox documentation into a separate section. See #3341
=== was not testing what it thought it did
Getting started link to Activator
 #3335 - Adding connection timeout to TCP connections
Merge pull request #1481 from akka/wip-3341-split-out-mailbox-documentation-ban

Split mailbox documentation into a separate section #3341
remove fallback to default-dispatcher, see #3394
Merge pull request #1488 from akka/wip-3393-Trigger-NPE-∂π

do not close over context.self in TickGenerator, see #3393
Merge pull request #1484 from akka/wip-3192-FIXMEs-∂π

fix some FIXMEs, see #3192
Disable cluster stats by default, see #3348

* Add VectorClockStats
Merge pull request #1486 from akka/wip-3348-ClusterStats-patriknw

Disable cluster stats by default, see #3348