Show template path when render template in layout

It seems that the template path rendered in layout not be shown. Added it :smile: 
```erb
<%# app/views/layouts/application.html.erb %>
<div id="wrapper">
  <%= yield %>
</div>
```
to
```html
<div id="wrapper">
  <!-- BEGIN app/views/examples/index.html.erb -->
  ...
  <!-- END app/views/examples/index.html.erb -->
</div>
```