Replace bootstrap logic with 'boot.js', use 'component/dart' mime-type and add

pkg/polymer/example/scoped_style/my_test.html

Index: pkg/polymer/example/scoped_style/my_test.html
diff --git a/pkg/polymer/example/scoped_style/my_test.html b/pkg/polymer/example/scoped_style/my_test.html
index c759c667d750a681e84ec077464b874cd4b6ef5d..9816fae0770f3f6c9b253fcc9053c8ad18a962e8 100644
--- a/pkg/polymer/example/scoped_style/my_test.html
+++ b/pkg/polymer/example/scoped_style/my_test.html
@@ -5,7 +5,7 @@
     </style>
     <p>Inside element, should be red</p>
   </template>
-  <script type="application/dart">
+  <script type="application/dart;component=1">
     import 'package:polymer/polymer.dart';
 
     @CustomTag('my-test')