Merge pull request #254 from NativeScript/dtodorov/update-app-run

Update app run

Author: elena-p

demo/app/app-root.xml

@@ -0,0 +1,2 @@
+<Frame defaultPage="main-page">
+</Frame>

demo/app/app.ts

@@ -1,4 +1,4 @@
 import * as application from 'tns-core-modules/application';
 
 application.setCssFileName("./app.css");
-application.start({ moduleName: "main-page" });
+application.run({ moduleName: "app-root" });