listen to address param

lib/expressapp.js

@@ -277,8 +277,11 @@ ExpressApp.prototype.start = function(opts, cb) {
   });
 
   router.get('/v1/utxos/', function(req, res) {
+    var opts = {};
+    var addresses = req.query.addresses;
+    if (addresses && _.isString(addresses)) opts.addresses = req.query.addresses.split(',');
     getServerWithAuth(req, res, function(server) {
-      server.getUtxos({}, function(err, utxos) {
+      server.getUtxos(opts, function(err, utxos) {
         if (err) return returnError(err, res, req);
         res.json(utxos);
       });

lib/server.js

@@ -154,7 +154,6 @@ WalletService.getInstance = function(opts) {
  * @param {string} opts.clientVersion - A string that identifies the client issuing the request
  */
 WalletService.getInstanceWithAuth = function(opts, cb) {
-
   if (!Utils.checkRequired(opts, ['copayerId', 'message', 'signature']))
     return cb(new ClientError('Required argument missing'));