unit test for evaluation; sorting on product and evaluation

unit test for evaluation; 
sorting on product and evaluation
The script tag should go inside Scripts section, we defined in layout:

```html
@section Scripts {
    <script>
        // now this will be rendered just before closing the body tag
        // watch this video to see why it matters:
        // http://channel9.msdn.com/events/MIX/MIX11/HTM01
    </script>
}
```