Fix #185: Reset the page to the first page when changing the url with refresh method.

src/bootstrap-table.js

@@ -1373,6 +1373,7 @@
     BootstrapTable.prototype.refresh = function (params) {
         if (params && params.url) {
             this.options.url = params.url;
+            this.options.pageNumber = 1;
         }
         this.initServer(params && params.silent);
     };