Initialize ionic on device ready

1. Remove ng-app attribute from <HTML> tag.

2. Add below code in your index.html:

<script>
     // Wait for Cordova to load
     document.addEventListener("deviceready", onDeviceReady, false);

     // Cordova is ready
     function onDeviceReady() {
          app.services = angular.module('services', ['ngResource']);
          angular.bootstrap(document, ['ionicApp']);
     }
</script>