fix(docs): export bootstrap in core.ts but not in core.dart

modules/angular2/angular2.ts

@@ -1,7 +1,6 @@
 /**
  * The `angular2` is the single place to import all of the individual types.
  */
-export {commonBootstrap as bootstrap} from 'angular2/src/core/application_common';
 
 // TODO(someone familiar with systemjs): the exports below are copied from
 // angular2_exports.ts. Re-exporting from angular2_exports.ts causes systemjs

modules/angular2/core.dart

@@ -0,0 +1,31 @@
+library angular2.core;
+
+export 'package:angular2/src/core/application_tokens.dart' show APP_COMPONENT;
+export 'package:angular2/src/core/application_common.dart' show ApplicationRef;
+
+// Compiler Related Dependencies.
+export 'package:angular2/src/services/app_root_url.dart' show AppRootUrl;
+export 'package:angular2/src/services/url_resolver.dart' show UrlResolver;
+export 'package:angular2/src/core/compiler/component_url_mapper.dart'
+    show ComponentUrlMapper;
+export 'package:angular2/src/core/compiler/directive_resolver.dart'
+    show DirectiveResolver;
+export 'package:angular2/src/core/compiler/compiler.dart' show Compiler;
+
+export 'package:angular2/src/core/compiler/view_manager.dart' show AppViewManager;
+export 'package:angular2/src/core/compiler/query_list.dart' show QueryList;
+export 'package:angular2/src/core/compiler/dynamic_component_loader.dart'
+    show DynamicComponentLoader;
+export 'package:angular2/src/core/life_cycle/life_cycle.dart' show LifeCycle;
+
+export 'package:angular2/src/core/compiler/element_ref.dart' show ElementRef;
+export 'package:angular2/src/core/compiler/template_ref.dart' show TemplateRef;
+export 'package:angular2/src/core/compiler/view_ref.dart'
+    show ViewRef, HostViewRef, ProtoViewRef;
+export 'package:angular2/src/core/compiler/view_container_ref.dart'
+    show ViewContainerRef;
+export 'package:angular2/src/core/compiler/dynamic_component_loader.dart'
+    show ComponentRef;
+
+export 'package:angular2/src/core/zone/ng_zone.dart' show NgZone;
+export 'package:angular2/src/facade/async.dart' show Observable, EventEmitter;

modules/angular2/core.ts

@@ -4,7 +4,7 @@
  * Define angular core API here.
  */
 export {APP_COMPONENT} from 'angular2/src/core/application_tokens';
-export {ApplicationRef} from 'angular2/src/core/application_common';
+export {ApplicationRef, commonBootstrap as bootstrap} from 'angular2/src/core/application_common';
 export {Type} from 'angular2/src/facade/lang';