docs: Update app component name to match new CLI syntax

Updating the AppComponent name to be in consistent with rest of the tutorial, as the name changed when the Angular CLI updated the nomenclature.

Closes #604

docs/1-install-and-setup.md

@@ -99,7 +99,7 @@ import { AngularFire, FirebaseListObservable } from 'angularfire2';
   templateUrl: 'app.component.html',
   styleUrls: ['app.component.css']
 })
-export class <MyApp>Component {
+export class AppComponent {
   constructor(af: AngularFire) {
 
   }