fixes #221, initial sync*, async, async* implementation

lib/src/server/server.dart

Index: lib/src/server/server.dart
diff --git a/lib/src/server/server.dart b/lib/src/server/server.dart
index f3343c59b0c034df29289f657fa1b5758909116b..b297a88bdbe85255b4968c1fa359db65108d7b58 100644
--- a/lib/src/server/server.dart
+++ b/lib/src/server/server.dart
@@ -299,8 +299,8 @@ class _ExistingSourceUriResolver implements UriResolver {
   final UriResolver resolver;
   _ExistingSourceUriResolver(this.resolver);
 
-  Source resolveAbsolute(Uri uri) {
-    var src = resolver.resolveAbsolute(uri);
+  Source resolveAbsolute(Uri uri, [Uri actualUri]) {
+    var src = resolver.resolveAbsolute(uri, actualUri);
     return src.exists() ? src : null;
   }
   Uri restoreAbsolute(Source source) => resolver.restoreAbsolute(source);