Add support for jslint and cleanup core JavaScript files

ports/lua/lua.js

 /*
  * Copyright (c) 2013 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /* globals NaClTerm, lib */
 
 'use strict';
 
@@ skipping 14 matching lines @@
     fileEntry.createWriter(function(fileWriter) {
     // Note: write() can take a File or Blob object.
     fileWriter.write(file);
     log("File uploaded!\n");
     }, fsErrorHandler);
   }, fsErrorHandler);
 }
 
 function uploadFiles(evt) {
   var files = evt.srcElement.files;
-  for (var i = 0; i < files.length; i++) {
+  var i;
+  for (i = 0; i < files.length; i++) {
     uploadFile(files[i]);
   }
 }
 
 function onInitFS(fs) {
   var upload = document.getElementById('upload');
   if (upload !== null) {
     upload.addEventListener('change', uploadFiles, false);
     window.fs = fs;
   }
@@ skipping 11 matching lines @@
       NaClTerm.init();
     }
   );
 }
 
 window.onload = function() {
   lib.init(function() {
     onInit();
   });
 };