Update bus marker icon to use directional icon, centered

Also updates the bus loop to match production timeout and json endpoint.
The expectation is that there is an external process that continually
processes the busproxy script that updates the bus.json file.

www/js/map.js

@@ -89,6 +89,17 @@
 				}
 			},
 
+			angleToCardinal = function(angle) {
+				var cardinals = ['n', 'ne', 'e', 'se', 's', 'sw', 'w', 'nw'], i;
+
+				i = Math.round(angle / (360 / cardinals.length)) % cardinals.length;
+				if (i < 0) {
+					i += cardinals.length;
+				}
+
+				return cardinals[i];
+			},
+
 			initialize = function(markerTypes) {
 				var
 					mapOptions = {
@@ -301,7 +312,7 @@
 				busLoop = function() {
 					busTimeout = true;
 					$.ajax({
-						url: UNL_TOUR_URL + 'busproxy.php',
+						url: UNL_TOUR_URL + 'bus.json',
 						dataType: 'json',
 						success: function(data) {
 							$.each(data.VehicleArray, function(key, value) {
@@ -319,14 +330,20 @@
 									return;
 								}
 
+								var icon = {
+									url: UNL_TOUR_URL + 'images/markers/google/bus-' + angleToCardinal(value.vehicle.CVLocation.angle) + '.png',
+									anchor: new google.maps.Point(16, 16)
+								};
+
 								if (markers['buses'][value.vehicle.id]) {
 									markers['buses'][value.vehicle.id].setPosition(new google.maps.LatLng(value.vehicle.CVLocation.latitude/100000, value.vehicle.CVLocation.longitude/100000));
+									markers['buses'][value.vehicle.id].setIcon(icon);
 								} else {
 									markers['buses'][value.vehicle.id] = new google.maps.Marker({
 										position : new google.maps.LatLng(value.vehicle.CVLocation.latitude/100000, value.vehicle.CVLocation.longitude/100000),
 										map      : UNLTourMap.map,
 										title    : 'Route ' + value.vehicle.routeID,
-										icon     : UNL_TOUR_URL + 'images/markers/google/busstop.png',
+										icon     : icon,
 										clickable: false,
 									});
 								}
@@ -334,7 +351,7 @@
 						},
 						complete: function() {
 							if (busTimeout) {
-								busTimeout = setTimeout(busLoop, 500);
+								busTimeout = setTimeout(busLoop, 1500);
 							}
 						}
 					});