Remove inline load static file. Register fields on load page

Remove inline load static file. 
Register fields on load page.
Ad now you must manually include css na js files, example:
```
<link rel="stylesheet" href="{{ STATIC_URL }}css/ajax_select.css">
<script type="text/javascript" src="{{ STATIC_URL }}assets/js/fill-fields.js"></script>
```

why object, instead of just instance?