Fixed the GUI to work with the recent API changes

Change-Id: I981d3cee108625842edd7794e99473acff01fbb7
diff --git a/web/js/topo.js b/web/js/topo.js
index 2648fc4..4c6e517 100644
--- a/web/js/topo.js
+++ b/web/js/topo.js
@@ -24,12 +24,12 @@
     links.forEach(function(item) {
 	var link={};
 	for (var i = 0; i < sws.length; i++){
-	    if(sws[i].name == item['src-switch'])
+	    if(sws[i].name == item['src']['dpid'])
 		break;
 	}
 	link.source=i;
 	for (var i = 0; i < sws.length; i++){
-	    if(sws[i].name == item['dst-switch'])
+	    if(sws[i].name == item['dst']['dpid'])
 		break;
 	}
 	link.target=i;