"use strict" in most (if not all) our javascript

+ fix one variable leaking in global nameespace

IPython/html/static/base/js/dialog.js

@@ -12,6 +12,7 b''
 IPython.namespace('IPython.dialog');
 
 IPython.dialog = (function (IPython) {
+    "use strict";
     
     var modal = function (options) {
         var dialog = $("<div/>").addClass("modal").attr("role", "dialog");

IPython/html/static/base/js/events.js

@@ -17,6 +17,7 b''
 // $([IPython.events]).on('event.Namespace',function () {});
 
 var IPython = (function (IPython) {
+    "use strict";
 
     var utils = IPython.utils;
 

IPython/html/static/base/js/namespace.js

@@ -8,6 +8,8 b''
 var IPython = IPython || {};
 
 IPython.namespace = function (ns_string) {
+    "use strict";
+
     var parts = ns_string.split('.'),
         parent = IPython,
         i;

IPython/html/static/base/js/page.js

@@ -10,6 +10,7 b''
 //============================================================================
 
 var IPython = (function (IPython) {
+    "use strict";
 
     var Page = function () {
         this.style();

IPython/html/static/base/js/pagemain.js

@@ -11,6 +11,7 b''
 
 
 $(document).ready(function () {
+    "use strict";
 
     IPython.page = new IPython.Page();
     IPython.page.show();

IPython/html/static/base/js/utils.js

@@ -11,6 +11,7 b''
 IPython.namespace('IPython.utils');
 
 IPython.utils = (function (IPython) {
+    "use strict";
 
     //============================================================================
     // Cross-browser RegEx Split
@@ -366,7 +367,7 b' IPython.utils = (function (IPython) {'
     };
 
     // http://stackoverflow.com/questions/2400935/browser-detection-in-javascript
-    browser = (function() {
+    var browser = (function() {
         var N= navigator.appName, ua= navigator.userAgent, tem;
         var M= ua.match(/(opera|chrome|safari|firefox|msie)\/?\s*(\.?\d+(\.\d+)*)/i);
         if (M && (tem= ua.match(/version\/([\.\d]+)/i))!= null) M[2]= tem[1];

IPython/html/static/notebook/js/cell.js

@@ -16,6 +16,7 b''
  */
 
 var IPython = (function (IPython) {
+    "use strict";
 
     var utils = IPython.utils;
 

IPython/html/static/notebook/js/codemirror-ipython.js

@@ -4,6 +4,7 b''
 // to do, but at least the simple one for now.
 
 CodeMirror.requireMode('python',function(){
+    "use strict";
 
     CodeMirror.defineMode("ipython", function(conf, parserConf) {
 

IPython/html/static/notebook/js/config.js

@@ -15,6 +15,7 b''
  **/
 
 var IPython = (function (IPython) {
+    "use strict";
         /**
          * A place where some stuff can be confugured.
          *

IPython/html/static/notebook/js/layoutmanager.js

@@ -10,6 +10,7 b''
 //============================================================================
 
 var IPython = (function (IPython) {
+    "use strict";
 
     var LayoutManager = function () {
         this.bind_events();

IPython/html/static/notebook/js/maintoolbar.js

@@ -10,6 +10,7 b''
 //============================================================================
 
 var IPython = (function (IPython) {
+    "use strict";
 
     var MainToolBar = function (selector) {
         IPython.ToolBar.apply(this, arguments);

IPython/html/static/notebook/js/menubar.js

@@ -17,6 +17,7 b''
 
 
 var IPython = (function (IPython) {
+    "use strict";
 
     /**
      * A MenuBar Class to generate the menubar of IPython noteboko

IPython/html/static/notebook/js/notebook.js

@@ -10,6 +10,7 b''
 //============================================================================
 
 var IPython = (function (IPython) {
+    "use strict";
 
     var utils = IPython.utils;
     var key   = IPython.utils.keycodes;

IPython/html/static/notebook/js/pager.js

@@ -10,6 +10,7 b''
 //============================================================================
 
 var IPython = (function (IPython) {
+    "use strict";
 
     var utils = IPython.utils;
 

IPython/html/static/notebook/js/quickhelp.js

@@ -10,6 +10,7 b''
 //============================================================================
 
 var IPython = (function (IPython) {
+    "use strict";
 
     var QuickHelp = function (selector) {
     };

IPython/html/static/notebook/js/savewidget.js

@@ -10,6 +10,7 b''
 //============================================================================
 
 var IPython = (function (IPython) {
+    "use strict";
 
     var utils = IPython.utils;
 

IPython/html/static/notebook/js/toolbar.js

@@ -15,6 +15,7 b''
  */
 
 var IPython = (function (IPython) {
+    "use strict";
 
     /**
      * A generic toolbar on which one can add button