Merge remote-tracking branch 'origin/master' into wip-2.10.0-RC1-∂π

- currently cheating: uses zeroMQ artifacts for scala 2.10M7
- fixed a bunch of more wrong references to scala.concurrent.util

akka-docs/rst/common/code/docs/circuitbreaker/DangerousJavaActor.java

@@ -8,7 +8,7 @@ package docs.circuitbreaker;
 import akka.actor.UntypedActor;
 import scala.concurrent.Future;
 import akka.event.LoggingAdapter;
-import scala.concurrent.util.Duration;
+import scala.concurrent.duration.Duration;
 import akka.pattern.CircuitBreaker;
 import akka.event.Logging;