Revert "feat(core): extract platforms out of core"

This reverts commit 3f4628c0b0.

modules/angular2/src/core/application.dart

@@ -0,0 +1,29 @@
+library angular2.src.core.application;
+
+import 'dart:async';
+
+import 'package:angular2/src/core/reflection/reflection.dart' show reflector;
+import 'package:angular2/src/core/reflection/reflection_capabilities.dart'
+    show ReflectionCapabilities;
+import 'application_common.dart';
+
+import 'package:angular2/src/compiler/compiler.dart';
+import 'package:angular2/src/core/linker/dynamic_component_loader.dart';
+export 'package:angular2/src/core/linker/dynamic_component_loader.dart'
+    show ComponentRef;
+
+/// Starts an application from a root component. This implementation uses
+/// mirrors. Angular 2 transformer automatically replaces this method with a
+/// static implementation (see `application_static.dart`) that does not use
+/// mirrors and produces a faster and more compact JS code.
+///
+/// See [commonBootstrap] for detailed documentation.
+Future<ComponentRef> bootstrap(Type appComponentType,
+    [List componentInjectableProviders]) {
+  reflector.reflectionCapabilities = new ReflectionCapabilities();
+  var providers = [compilerProviders()];
+  if (componentInjectableProviders != null) {
+    providers.add(componentInjectableProviders);
+  }
+  return commonBootstrap(appComponentType, providers);
+}