add preprocessor for RST docs, see #2461 and #2431

The idea is to filter the sources, replacing @<var>@ occurrences with
the mapping for <var> (which is currently hard-coded). @@ -> @. In order
to make this work, I had to move the doc sources one directory down
(into akka-docs/rst) so that the filtered result could be in a sibling
directory so that relative links (to _sphinx plugins or real code) would
continue to work.

While I was at it I also changed it so that WARNINGs and ERRORs are not
swallowed into the debug dump anymore but printed at [warn] level
(minimum).

One piece of fallout is that the (online) html build is now run after
the normal one, not in parallel.

akka-docs/rst/java/code/docs/remoting/RemoteDeploymentDocTestBase.java

@@ -0,0 +1,46 @@
+/**
+ * Copyright (C) 2009-2012 Typesafe Inc. <http://www.typesafe.com>
+ */
+package docs.remoting;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+//#import
+import akka.actor.ActorRef;
+import akka.actor.Address;
+import akka.actor.AddressFromURIString;
+import akka.actor.Deploy;
+import akka.actor.Props;
+import akka.actor.ActorSystem;
+import akka.remote.RemoteScope;
+//#import
+
+public class RemoteDeploymentDocTestBase {
+  
+  static ActorSystem system;
+  
+  @BeforeClass
+  public static void init() {
+    system = ActorSystem.create();
+  }
+  
+  @AfterClass
+  public static void cleanup() {
+    system.shutdown();
+  }
+  
+  @Test
+  public void demonstrateDeployment() {
+    //#make-address
+    Address addr = new Address("akka", "sys", "host", 1234);
+    addr = AddressFromURIString.parse("akka://sys@host:1234"); // the same
+    //#make-address
+    //#deploy
+    ActorRef ref = system.actorOf(new Props(RemoteDeploymentDocSpec.Echo.class).withDeploy(new Deploy(new RemoteScope(addr))));
+    //#deploy
+    assert ref.path().address().equals(addr);
+  }
+  
+}