Add the ability for Pods pagination to use WordPress "list" option

Add the ability for Pods pagination to use the WordPress "list" option of `paginate_links()`.

Basically a clone of the "paginate" option but adding in `'type' => 'list'` and changing the surrounding `<span>` to a `<div>`. This was mainly done for interaction with [Bootstrap pagination](http://twitter.github.io/bootstrap/components.html#pagination) abilities.