Add untyped transactor

akka-stm/src/test/java/akka/transactor/example/Increment.java

@@ -0,0 +1,21 @@
+package akka.transactor.example;
+
+import akka.actor.ActorRef;
+
+public class Increment {
+    private ActorRef friend = null;
+
+    public Increment() {}
+
+    public Increment(ActorRef friend) {
+        this.friend = friend;
+    }
+
+    public boolean hasFriend() {
+        return friend != null;
+    }
+
+    public ActorRef getFriend() {
+        return friend;
+    }
+}