Update utils to new library syntax.

utils/tests/template/test_nested.dart

 // Sample for #with templates:
 //
 //       productview.tmpl
 //       productview2.tmpl
 
 
-#import('dart:html');
-#source('nestedview.dart');
+import 'dart:html';
+part 'nestedview.dart';
 
 class Person {
   String name;
   int age;
 
   Person(this.name, this.age);
 }
 
 void main() {
   // Simple template.
   Person person1 = new Person("Aristotle - Bugger for the bottle", 52);
   Person person2 = new Person("René Descartes - Drunken fart", 62);
 
   NestedView view = new NestedView(person1, person2);
   document.body.elements.add(view.root);
 }