rename ActorSystem.stop() to .shutdown()

akka-tutorials/akka-tutorial-first/src/main/java/akka/tutorial/first/java/Pi.java

@@ -168,6 +168,6 @@ public class Pi {
         latch.await();
 
         // Shut down the system
-        system.stop();
+        system.shutdown();
     }
 }

akka-tutorials/akka-tutorial-first/src/main/scala/Pi.scala

@@ -102,6 +102,6 @@ object Pi extends App {
     latch.await()
 
     // Shut down the system
-    system.stop()
+    system.shutdown()
   }
 }

akka-tutorials/akka-tutorial-first/src/test/scala/WorkerSpec.scala

@@ -17,7 +17,7 @@ class WorkerSpec extends WordSpec with MustMatchers with BeforeAndAfterAll {
   implicit val system = ActorSystem()
 
   override def afterAll {
-    system.stop()
+    system.shutdown()
   }
 
   "Worker" must {