Add provider config code to demo page

Author: Jurgen Van de Moere

demo/app.js

@@ -6,6 +6,14 @@ angular.module('app')
         console.log('Animation enabled: ' + $animate.enabled());
     }]);
 
+angular.module('app')
+    .config(['growlNotificationsProvider', function(growlNotificationsProvider){
+
+        // Any config work you want here...
+        // growlNotificationsProvider.cssPrefix('growwwwwl');
+
+    }]);
+
 angular.module('app')
     .controller('MainCtrl', ['$scope', 'growlNotifications', function($scope, growlNotifications){