add Java API for most case objects

- “case object” will emit a concrete class without constructor, so put
  abstract class in its way in order to obtain an accessible type for
  Scala & Java (i.e. without $)
- add “def instance = this” to make access uniform from Java
- this does not work for nested case objects because of missing static
  forwarders, so keep those as they were
- fix issue with case object FromConfig colliding with case class
  FromConfig by open-coding the “case”iness in this case (should be
  thrown out in 2.1)

akka-actor-tests/src/test/java/akka/actor/JavaAPI.java

@@ -1,7 +1,12 @@
 package akka.actor;
 
 import akka.actor.ActorSystem;
+import akka.event.Logging;
+import akka.event.Logging.LoggerInitialized;
 import akka.japi.Creator;
+import akka.routing.CurrentRoutees;
+import akka.routing.FromConfig;
+import akka.routing.NoRouter;
 import akka.testkit.AkkaSpec;
 
 import org.junit.AfterClass;
@@ -23,6 +28,23 @@ public class JavaAPI {
     system.shutdown();
     system = null;
   }
+  
+  // compilation tests
+  @SuppressWarnings("unused")
+  public void mustCompile() {
+    final Kill kill = Kill.instance();
+    final PoisonPill pill = PoisonPill.instance();
+    final ReceiveTimeout t = ReceiveTimeout.instance();
+
+    final LocalScope ls = LocalScope.instance();
+    final NoScopeGiven noscope = NoScopeGiven.instance();
+    
+    final LoggerInitialized x = Logging.loggerInitialized();
+    
+    final CurrentRoutees r = CurrentRoutees.instance();
+    final NoRouter nr = NoRouter.instance();
+    final FromConfig fc = FromConfig.instance();
+  }
 
   @Test
   public void mustBeAbleToCreateActorRefFromClass() {