Use resolvePath to give google maps path to grey marker

Needed for vulcanizer to fix the path

Author: dfreedm

shiny/Shuttle-v2/shuttle-map.html

@@ -65,7 +65,7 @@
           var marker = new google.maps.Marker({
             map: this.map,
             position: latLng,
-            icon: 'assets/marker_grey.png',
+            icon: this.resolvePath('assets/marker_grey.png'),
             zIndex: 0
           });
           this.markers.push(marker);
@@ -94,4 +94,4 @@
       }
     });
   </script>
-</polymer-element>
+</polymer-element>