anchor.diff:  
     <%= f.submit nil, class: 'btn btn-default' %>
   <% end %>
  -
  -<script>
  -$('#tabs a').click(function(e) {
  -  e.preventDefault();
  -  $(this).tab('show');
  -})
  -</script>
  
positive.code:     <%= f.label :title %>
      <%= f.text_field :title, class: 'form-control' %>
    </div>
    
    <ul id="tabs" class="nav nav-tabs">
      <li class="active"><a href="#link">Share a Link</a></li>
      <li><a href="#tutorial">Write a tutorial</a></li>
  
negative.code:     </div>
  
      <div class="tab-pane" id="tutorial">
  <!--       <div class="form-group">
          <%= f.label :body_markdown %><br>
          <%= f.text_area :body_markdown %>
  