=doc #3685 Add FAQ to documentation

* The links at http://akka.io will changed to point at this faq
* Some rewording of guarantees/reliability

akka-docs/rst/additional/code/docs/osgi/Activator.scala

@@ -0,0 +1,25 @@
+package docs.osgi
+
+case object SomeMessage
+
+class SomeActor extends akka.actor.Actor {
+  def receive = { case SomeMessage => }
+}
+
+//#Activator
+import akka.actor.{ Props, ActorSystem }
+import org.osgi.framework.BundleContext
+import akka.osgi.ActorSystemActivator
+
+class Activator extends ActorSystemActivator {
+
+  def configure(context: BundleContext, system: ActorSystem) {
+    // optionally register the ActorSystem in the OSGi Service Registry
+    registerService(context, system)
+
+    val someActor = system.actorOf(Props[SomeActor], name = "someName")
+    someActor ! SomeMessage
+  }
+
+}
+//#Activator