[TIMOB-17358] Android: Refactor notifications

   // Create the notification
   var notification = Titanium.Android.createNotification({
       contentTitle: 'Notification 1',
       contentText : 'Just a notification',
       category: Titanium.Android.CATEGORY_MESSAGE,
       priority: Titanium.Android.PRIORITY_HIGH
   });
   
   // Create the notification
   var notification2 = Titanium.Android.createNotification({
       contentTitle: 'Notification 2',
       contentText : 'Just another notification',
   });
   
   var window = Ti.UI.createWindow();
   var button = Ti.UI.createButton({
   	title: 'Send Notification 1',
   	top:100
   });
   
   var button2 = Ti.UI.createButton({
   	title: 'Send Notification 2',
   	top: 300
   });
   
   window.add(button);
   window.add(button2);
   window.open();
   
   button.addEventListener('click', function(e) {
   	// Send the notification.
   	Titanium.Android.NotificationManager.notify(1, notification);
   });
   
   button2.addEventListener('click', function(e) {
   	// Send the notification.
   	Titanium.Android.NotificationManager.notify(2, notification2);
   });