Added libraryDependencies info for sbt users below 0.12.x

Removed crossString
fix two bugs in LARS, see #2950

- initial setting of the repeated task raced with first execution, when
  the latter won the task would not repeat
- there was a race in task submission which could lead to enqueueing one
  round too late
Merge pull request #1099 from akka/wip-2978-non-direct-∂π

remove old “direct” router references, see #2978
Merge pull request #1091 from jamie-allen/wip-2984-sbt-documentation

Added libraryDependencies info for sbt users below 0.12.x
Failure detector refactoring, see #2690

* Failure detector was previously copied with refactoring to
  akka-remote and this refactoring makes use of that and removes
  the failure detector in akka-cluster
* Adjustments to reference.conf
* Refactoring of FailureDetectorPuppet
Merge pull request #1086 from akka/wip-2690-remote-fd-patriknw

Failure detector refactoring, see #2690
Merge pull request #1101 from akka/wip-2950-LARS-race-∂π

fix two bugs in LARS, see #2950
Adding implicits and diagrams to scaladoc. See #2880
Merge pull request #1093 from akka/wip-2880-use-new-scaladoc-features-ban

Adding implicits and diagrams to scaladoc. See #2880
Temporary LIMBO commit, but UDP now uses the unified selector
Another LIMBO commit, but TCP now uses the unified selector
Merge pull request #1079 from akka/wip-2954-transport-startup-timeout-patriknw

Increase remoting startup/shutdown timeouts, see #2954
final review comments

- make it EXPERIMENTAL
- shuffle docs around to be less scary
- reuse sameThreadExecutionContext in CircuitBreaker
- typos
Merge pull request #1097 from akka/wip-channels-∂π

add Typed Channels, see #2929
Merge pull request #1089 from Crossing-Tech/corrections

correction of akka-osgi imports (missing imports)
remove test apidocs from unidoc
DSL element for future transformations in send pipeline
Do not interrupt LARS at shutdown or tasks might fail. See #3005
Do not try to generate ScalaDoc diagrams for akka-channels-tests since it will contain none. See #3010
Various fixes to tests