docs(dart): change imports from bootstrap.dart to platform/browser.dart

closes #1013

public/docs/_examples/architecture/dart/web/main.dart

@@ -1,5 +1,6 @@
 // #docregion
-import 'package:angular2/bootstrap.dart';
+import 'package:angular2/platform/browser.dart';
+
 import 'package:developer_guide_intro/backend_service.dart';
 import 'package:developer_guide_intro/hero_list_component.dart';
 import 'package:developer_guide_intro/hero_service.dart';

public/docs/_examples/attribute-directives/dart/web/main.dart

@@ -1,5 +1,6 @@
 // #docregion
-import 'package:angular2/bootstrap.dart';
+import 'package:angular2/platform/browser.dart';
+
 import 'package:attribute_directives/app_component.dart';
 
 main() {

public/docs/_examples/dependency-injection/dart/web/main.dart

@@ -1,6 +1,6 @@
 //#docregion
-
 import 'package:angular2/platform/browser.dart';
+
 import 'package:dependency_injection/app_component.dart';
 import 'package:dependency_injection/providers_component.dart';
 
@@ -9,4 +9,4 @@ main() {
   bootstrap(AppComponent);
   //#enddocregion bootstrap
   bootstrap(ProvidersComponent);
-}
+}

public/docs/_examples/displaying-data/dart/web/main.dart

@@ -1,7 +1,8 @@
 // #docplaster
 // #docregion final
-import 'package:angular2/bootstrap.dart';
+import 'package:angular2/platform/browser.dart';
 // #enddocregion final
+
 //import 'package:displaying_data/app_component_1.dart' as v1;
 //import 'package:displaying_data/app_component_2.dart' as v2;
 //import 'package:displaying_data/app_component_3.dart' as v3;

public/docs/_examples/forms/dart/web/main.dart

@@ -1,5 +1,6 @@
 // #docregion
-import 'package:angular2/bootstrap.dart';
+import 'package:angular2/platform/browser.dart';
+
 import 'package:hero_form/hero_form_component.dart';
 
 main() {

public/docs/_examples/hierarchical-dependency-injection/dart/web/main.dart

@@ -1,5 +1,6 @@
 // #docregion
-import 'package:angular2/bootstrap.dart';
+import 'package:angular2/platform/browser.dart';
+
 import 'package:hierarchical_di/heroes_list_component.dart';
 import 'package:hierarchical_di/heroes_service.dart';
 

public/docs/_examples/lifecycle-hooks/dart/web/main.dart

@@ -1,5 +1,6 @@
 // #docregion
-import 'package:angular2/bootstrap.dart';
+import 'package:angular2/platform/browser.dart';
+
 import 'package:lifecycle_hooks/app_component.dart';
 
 main() {

public/docs/_examples/pipes/dart/web/main.dart

@@ -1,4 +1,5 @@
-import 'package:angular2/bootstrap.dart';
+import 'package:angular2/platform/browser.dart';
+
 import 'package:pipe_examples/app_component.dart';
 import 'package:pipe_examples/hero_birthday1_component.dart';
 

public/docs/_examples/quickstart/dart/ex1/web/main.dart

@@ -1,6 +1,6 @@
 // #docregion
-import 'package:angular2/bootstrap.dart';
 import 'package:angular2/core.dart';
+import 'package:angular2/platform/browser.dart';
 
 @Component(selector: 'my-app', template: '<h1>My First Angular 2 App</h1>')
 class AppComponent {}

public/docs/_examples/quickstart/dart/ex2/web/main.dart

@@ -1,6 +1,6 @@
 // #docregion
-import 'package:angular2/bootstrap.dart';
 import 'package:angular2/core.dart';
+import 'package:angular2/platform/browser.dart';
 
 @Component(selector: 'my-app', template: '<h1>My First Angular 2 App</h1>')
 class AppComponent {}

public/docs/_examples/server-communication/dart/web/main.dart

@@ -1,5 +1,6 @@
 // #docregion
-import 'package:angular2/bootstrap.dart';
+import 'package:angular2/platform/browser.dart';
+
 import 'package:server_communication/toh/toh_component.dart';
 import 'package:server_communication/wiki/wiki_component.dart';
 import 'package:server_communication/wiki/wiki_smart_component.dart';

public/docs/_examples/structural-directives/dart/web/main.dart

@@ -1,5 +1,6 @@
 // #docregion
-import 'package:angular2/bootstrap.dart';
+import 'package:angular2/platform/browser.dart';
+
 import 'package:structural_directives/structural_directives_component.dart';
 
 main() {

public/docs/_examples/template-syntax/dart/web/main.dart

@@ -1,5 +1,6 @@
 // #docregion
-import 'package:angular2/bootstrap.dart';
+import 'package:angular2/platform/browser.dart';
+
 import 'package:template_syntax/app_component.dart';
 
 void main() {

public/docs/_examples/toh-5/dart/web/main.dart

@@ -1,4 +1,4 @@
-import 'package:angular2/bootstrap.dart';
+import 'package:angular2/platform/browser.dart';
 
 import 'package:angular2_tour_of_heroes/app_component.dart';
 

public/docs/_examples/user-input/dart/web/main.dart

@@ -1,5 +1,6 @@
 // #docregion
-import 'package:angular2/bootstrap.dart';
+import 'package:angular2/platform/browser.dart';
+
 import 'package:user_input/app_component.dart';
 
 main() {

public/docs/dart/latest/quickstart.jade

@@ -107,7 +107,7 @@ p.
 
     The top lines import two libraries.
     *All* Dart files that use Angular APIs import `core.dart`.
-    Only files that call `bootstrap()` import `bootstrap.dart`.
+    Only files that call `bootstrap()` import `platform/browser.dart`.
 
 //-  ##########################
 .l-main-section