fix(nav-registry): NavRegistry is a singleton

ionic/components/nav/test/basic/index.ts

@@ -206,6 +206,7 @@ class AnotherPage {
 
 
 @App({
+  pages: [FirstPage, FullPage, PrimaryHeaderPage, AnotherPage],
   template: `<ion-nav [root]="root"></ion-nav>`
 })
 class E2EApp {

ionic/config/bootstrap.ts

@@ -20,9 +20,12 @@ import {initTapClick} from '../components/tap-click/tap-click';
 import * as dom from '../util/dom';
 
 
-export function ionicProviders(config) {
+export function ionicProviders(args) {
   let app = new IonicApp();
   let platform = new Platform();
+  let navRegistry = new NavRegistry(args.pages);
+
+  var config = args.config;
 
   if (!(config instanceof Config)) {
     config = new Config(config);
@@ -50,6 +53,7 @@ export function ionicProviders(config) {
     provide(Platform, {useValue: platform}),
     provide(FeatureDetect, {useValue: featureDetect}),
     provide(Events, {useValue: events}),
+    provide(NavRegistry, {useValue: navRegistry}),
     Form,
     Keyboard,
     OverlayController,
@@ -57,7 +61,6 @@ export function ionicProviders(config) {
     Modal,
     Popup,
     Translate,
-    NavRegistry,
     ROUTER_PROVIDERS,
     provide(LocationStrategy, {useClass: HashLocationStrategy}),
     HTTP_PROVIDERS,

ionic/config/decorators.ts

@@ -135,7 +135,7 @@ export function App(args={}) {
     Reflect.defineMetadata('annotations', annotations, cls);
 
     console.time('bootstrap');
-    bootstrap(cls, ionicProviders(args.config)).then(() => {
+    bootstrap(cls, ionicProviders(args)).then(() => {
       console.timeEnd('bootstrap');
     });