removed default username and password from javascript.

please use url http://user:pwd@localhost:28332 instead

js/twister_io.js

@@ -8,7 +8,9 @@
 
 // main json rpc method. receives callbacks for success and error
 function twisterRpc(method, params, resultFunc, resultArg, errorFunc, errorArg) {
-    var foo = new $.JsonRpcClient({ ajaxUrl: '/', username: 'user', password: 'pwd'});
+    // removing hardcoded username from javascript: please use url http://user:pwd@localhost:28332 instead
+    //var foo = new $.JsonRpcClient({ ajaxUrl: '/', username: 'user', password: 'pwd'});
+    var foo = new $.JsonRpcClient({ ajaxUrl: '/' });
     foo.call(method, params,
         function(ret) { resultFunc(resultArg, ret); },
         function(ret) { if(ret != null) errorFunc(errorArg, ret); }