parse querystring params as numbers

lib/expressapp.js

@@ -262,9 +262,9 @@ ExpressApp.start = function(opts) {
   router.get('/v1/txhistory/', function(req, res) {
     getServerWithAuth(req, res, function(server) {
       var opts = {};
-      if (req.param['minTs']) opts.minTs = req.params['minTs'];
-      if (req.param['maxTs']) opts.maxTs = req.params['maxTs'];
-      if (req.param['limit']) opts.limit = req.params['limit'];
+      if (req.query.minTs) opts.minTs = +req.query.minTs;
+      if (req.query.maxTs) opts.maxTs = +req.query.maxTs;
+      if (req.query.limit) opts.limit = +req.query.limit;
 
       server.getTxHistory(opts, function(err, txs) {
         if (err) return returnError(err, res, req);