Added builtin native call to exit the running vm

samples/total/src/TotalServer.dart

Index: samples/total/src/TotalServer.dart
diff --git a/samples/total/src/TotalServer.dart b/samples/total/src/TotalServer.dart
index 117ea9f34b030ee43523bd9c96609d704dfc2af5..b1ca2f1d5a7b5d7f25c851952a1d93fa1fb8c6b2 100644
--- a/samples/total/src/TotalServer.dart
+++ b/samples/total/src/TotalServer.dart
@@ -56,15 +56,15 @@ class TotalServer extends IsolatedServer {
   void restartServer(HTTPRequest request, HTTPResponse response) {
     writeData(request, response, 'Restarting, KBBS', 'text/plain');
     stop();
-    print("GRACEFUL RESTART!! TODO: make server exit gracefully");
-    throw "GRACEFUL RESTART!! TODO: make server exit gracefully";
+    print("GRACEFUL RESTART!!");
+    exit(42);
   }
 
   void stopServer(HTTPRequest request, HTTPResponse response) {
     writeData(request, response, 'Exiting, KTHXBYE', 'text/plain');
     stop();
-    print("GRACEFUL EXIT!! TODO: make server exit gracefully");
-    throw "GRACEFUL EXIT!! TODO: make server exit gracefully";
+    print("GRACEFUL EXIT!!");
+    exit(0);
   }
 
   void writeData(HTTPRequest request, HTTPResponse response, String message, String mimeType) {