Improves how to initialize polymer apps and fixes polymer build and linter to

samples/third_party/todomvc/test/markdone_test.dart

Index: samples/third_party/todomvc/test/markdone_test.dart
diff --git a/samples/third_party/todomvc/test/markdone_test.dart b/samples/third_party/todomvc/test/markdone_test.dart
index b9290b6af890f03d39a61572c467454cf625ac3b..38bcaba7e8f3c267279e513f52f5613578ead671 100644
--- a/samples/third_party/todomvc/test/markdone_test.dart
+++ b/samples/third_party/todomvc/test/markdone_test.dart
@@ -4,6 +4,7 @@
 
 library todomvc.test.markdone_test;
 
+import 'dart:async';
 import 'dart:html';
 import 'package:polymer/polymer.dart';
 import 'package:unittest/unittest.dart';
@@ -46,12 +47,14 @@ Node findShadowHost(Node node, ShadowRoot root) {
  * This test runs the TodoMVC app, adds a few todos, marks some as done
  * programatically, and clicks on a checkbox to mark others via the UI.
  */
-@initMethod init() {
+main() {
+  initPolymer();
   useHtmlConfiguration();
 
+  wrapMicrotask((){
   setUp(() => Polymer.onReady);
 
-  test('mark done', () {
+  test('mark done', wrapMicrotask(() {
     appModel.todos.add(new Todo('one (unchecked)'));
     appModel.todos.add(new Todo('two (unchecked)'));
     appModel.todos.add(new Todo('three (checked)')..done = true);
@@ -71,5 +74,6 @@ Node findShadowHost(Node node, ShadowRoot root) {
 
     node.dispatchEvent(new MouseEvent('click', detail: 1));
     expect(node.checked, isTrue, reason: 'element is checked');
-  });
+  }));
+  })();
 }