Update jQuery files

Demo theme: v1.10.2 -> v1.11.1
Backend: v2.0.3 -> v2.1.1
Furthermore I renamed the jquery-2.0.3.min.js file because of easy to
update jQuery in future.

modules/backend/layouts/_head.htm

@@ -9,7 +9,7 @@
 <link href="<?= Backend::skinAsset('assets/vendor/select2/select2.css') ?>" rel="stylesheet">
 <link href="<?= Backend::skinAsset('assets/css/october.css') ?>?v<?= System\Models\Parameters::get('system::core.build', 1) ?>" rel="stylesheet">
 
-<script src="<?= Backend::skinAsset('assets/js/vendor/jquery-2.0.3.min.js') ?>"></script>
+<script src="<?= Backend::skinAsset('assets/js/vendor/jquery.min.js') ?>"></script>
 <script src="<?= URL::asset('modules/system/assets/js/framework.js') ?>"></script>
 <script src="<?= Backend::skinAsset('assets/js/vendor/modernizr.min.js') ?>"></script>
 <script src="<?= Backend::skinAsset('assets/js/vendor/mousewheel.js') ?>"></script>

modules/backend/layouts/auth.htm

@@ -6,7 +6,7 @@
         <title><?= e(trans('backend::lang.auth.title')) ?></title>
         <link href="<?= URL::to('modules/backend/assets/css/october.css') ?>" rel="stylesheet">
 
-        <script src="<?= URL::to('modules/backend/assets/js/vendor/jquery-2.0.3.min.js') ?>"></script>
+        <script src="<?= URL::to('modules/backend/assets/js/vendor/jquery.min.js') ?>"></script>
         <script src="<?= URL::to('modules/system/assets/js/framework.js') ?>"></script>
         <script src="<?= URL::to('modules/backend/assets/js/october.utils.js') ?>"></script>
         <script src="<?= URL::to('modules/backend/assets/js/vendor/modernizr.min.js') ?>"></script>

modules/system/classes/CombineAssets.php

@@ -103,7 +103,7 @@ public function __construct()
         /*
          * Common Aliases
          */
-        $this->registerAlias('js', 'jquery', '~/modules/backend/assets/js/vendor/jquery-2.0.3.min.js');
+        $this->registerAlias('js', 'jquery', '~/modules/backend/assets/js/vendor/jquery.min.js');
         $this->registerAlias('js', 'framework', '~/modules/system/assets/js/framework.js');
         $this->registerAlias('js', 'framework.extras', '~/modules/system/assets/js/framework.extras.js');
         $this->registerAlias('css', 'framework.extras', '~/modules/system/assets/css/framework.extras.css');