geolocation added on offerCar and travel page

www/lib/ui-leaflet/grunt/utils/getAvailPort.js

@@ -0,0 +1,23 @@
+var exec = require('shelljs').exec;
+
+var isWin = /^win/.test(process.platform);
+
+var isPortOpen = function (port) {
+    var cmd;
+    if (isWin)
+        cmd = 'netstat -an | find /i ":' + port + '" | find /i "listening"';
+    else
+        cmd = 'lsof -i:' + port + " | tail -n 1 | awk '{print $2}'";
+    var portResponse = exec(cmd, {
+        silent: true
+    }).output;
+    return portResponse ? false : true;
+}
+
+module.exports = function (startPort) {
+    while (!isPortOpen(startPort)) {
+        startPort += 1;
+    }
+
+    return startPort;
+}