add new files

cms/static/coffee/src/views/tabs.coffee

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+class CMS.Views.TabsEdit extends Backbone.View
+  events:
+    'click .new-tab': 'addNewTab'
+
+  initialize: =>
+    @$('.component').each((idx, element) =>
+        new CMS.Views.ModuleEdit(
+            el: element,
+            onDelete: @deleteTab,
+            model: new CMS.Models.Module(
+                id: $(element).data('id'),
+            )
+        )
+    )
+
+    @$('.components').sortable(
+      handle: '.drag-handle'
+      update: (event, ui) => alert 'got it!'
+      helper: 'clone'
+      opacity: '0.5'
+      placeholder: 'component-placeholder'
+      forcePlaceholderSize: true
+      axis: 'y'
+      items: '> .component'
+    )    
+
+  addNewTab: (event) =>
+    event.preventDefault()
+
+    editor = new CMS.Views.ModuleEdit(
+      onDelete: @deleteTab
+      model: new CMS.Models.Module()
+    )
+
+    $('.new-component-item').before(editor.$el)
+
+    editor.cloneTemplate(
+      @model.get('id'),
+      'i4x://edx/templates/static_tab/Empty'
+    )
+
+  deleteTab: (event) =>
+    if not confirm 'Are you sure you want to delete this component? This action cannot be undone.'
+      return
+    $component = $(event.currentTarget).parents('.component')
+    $.post('/delete_item', {
+      id: $component.data('id')
+    }, =>
+      $component.remove()
+    )
+
+
+
+

cms/templates/edit-tabs.html

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+<%inherit file="base.html" />
+<%! from django.core.urlresolvers import reverse %>
+<%block name="title">Tabs</%block>
+<%block name="bodyclass">static-pages</%block>
+
+<%block name="jsextra">
+  <script type='text/javascript'>
+    new CMS.Views.TabsEdit({
+      el: $('.main-wrapper'),
+      model: new CMS.Models.Module({
+        id: '${context_course.location}'
+      })
+    });
+  </script>
+</%block>
+
+<%block name="content">
+<div class="main-wrapper">
+  <div class="inner-wrapper">
+    <h1>Static Tabs</h1>
+    <div class="main-column">
+ 	   <article class="unit-body window">
+		    <div class="tab-list">
+			    <ol class='components'>
+            % for id in components:
+            <li class="component" data-id="${id}"/>
+            % endfor
+                     
+            <li class="new-component-item">
+              <a href="#" class="new-component-button new-tab">
+                <span class="plus-icon"></span>New Tab
+              </a>
+			    	</li>
+			    </ol>      
+		    </div>
+		</article>
+    </div>
+  </div>
+</div>
+</%block>

common/lib/xmodule/xmodule/templates/about/empty.yaml

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+---
+metadata:
+    display_name: Empty
+data: "This is where you can add additional information about your course."
+children: []

common/lib/xmodule/xmodule/templates/courseinfo/empty.yaml

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+---
+metadata:
+    display_name: Empty
+data: "This is where you can add additional information about your course."
+children: []

common/lib/xmodule/xmodule/templates/statictab/empty.yaml

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+---
+metadata:
+    display_name: Empty
+data: "This is where you can add additional pages to your courseware. Click the 'edit' button to begin editing."
+children: []