Added apply_filters to uajax_result

Allows for developer to define their own template.

```
function my_load_template($template) {
	global $post;
    ob_start();
    include($template);
    $var = ob_get_contents();
    ob_end_clean();
    return $var;
}


function my_result_template() {
	global $post;
	return my_load_template(get_template_directory().'/some-template-single.php');
}
add_filter('uwpqsf_result_template', 'my_result_template');
```