fixed the way bounds are determined during bootstrap

Author: rossengeorgiev

cache.manifest

@@ -1,5 +1,5 @@
 CACHE MANIFEST
-# version 270
+# version 281
 
 # gogole maps files
 http://maps.google.com/maps/api/js?v=3.10&sensor=false&language=en_us&key=AIzaSyCOqkcNey4CCyG4X0X5qxHAhCgD8g5DwXg

js/tracker.js

@@ -1244,7 +1244,7 @@ function zoom_on_payload() {
         // find the bounds of the ballons first and last positions
         var bounds = new google.maps.LatLngBounds();
         bounds.extend(vehicles[i].positions[0]);
-        bounds.extend(vehicles[i].marker.getPosition());
+        bounds.extend(vehicles[i].positions[vehicles[i].positions.length - 1]);
 
         // fit the map to those bounds
         map.fitBounds(bounds);