[google-analytics] Tracking Google Analytics Page Views with AngularJS

Use GA 'set' to ensure routes are picked up for Google realtime analytics. Otherwise subsequent calls to GA will not show in the realtime panel.

$scope.$on('$routeChangeSuccess', function() {
    $window.ga('set', 'page', $location.url());
    $window.ga('send', 'pageview');
});

Google strongly advises this approach generally instead of passing a 3rd param in 'send'. https://developers.google.com/analytics/devguides/collection/analyticsjs/single-page-applications