Fix for info window appearing on wrong marker

The info window appear always on the marker named "foo". Using the marker id in showDetail makes it appears on the right marker.

Author: rocco

testapp/infowindow_ng_click.html

@@ -23,7 +23,7 @@
 
   vm.showDetail = function(e, shop) {
     vm.shop = shop;
-    vm.map.showInfoWindow('foo-iw', 'foo');
+    vm.map.showInfoWindow('foo-iw', shop.id);
   };
 
   vm.hideDetail = function() {