create akka-testkit subproject

- modify AkkaProject.scala
- move CallingThreadDispatcher & Spec and TestKit into akka-testkit
- update FSMTimingSpec accordingly

akka-testkit/src/test/scala/akka/testkit/CallingThreadDispatcherSpec.scala

@@ -0,0 +1,11 @@
+package akka.testkit
+
+import akka.actor.dispatch.ActorModelSpec
+
+class CallingThreadDispatcherTest extends ActorModelSpec {
+  import ActorModelSpec._
+  def newInterceptedDispatcher = new CallingThreadDispatcher with MessageDispatcherInterceptor
+  override def dispatcherShouldProcessMessagesInParallel {}
+}
+
+// vim: set ts=4 sw=4 et: