fix(package): return back required exports

Author: fshchudlo

README.md

@@ -32,7 +32,7 @@
 
 ```typescript
 
-import { I18NextModule } from 'i18next';
+import { I18NextModule } from 'angular-i18next';
 
 @NgModule({
   bootstrap: [ AppComponent ],
@@ -49,6 +49,8 @@ export class AppModule {}
 **3.** Inject I18NextService to AppComponent and call "init" method (with prefered [options]( http://i18next.com/docs/options/#init-options)). Or use more [advanced initialization](#initialize-i18next-before-angular-application).
 ```typescript
 
+import { I18NextService } from 'angular-i18next';
+
 export class AppComponent {
 
   constructor(private i18NextService: I18NextService) {

src/index.ts

@@ -1,3 +1,9 @@
+export * from './I18NEXT_TOKENS';
+export * from './I18NextPipe';
+export * from './I18NextCapPipe';
+export * from './I18NextService';
+export * from './I18NextTitle';
+
 import { NgModule, ModuleWithProviders } from '@angular/core';
 import { Title } from '@angular/platform-browser';
 import { I18NEXT_NAMESPACE, I18NEXT_SCOPE } from './I18NEXT_TOKENS';