Added type_for_url for more accurate permalinks

Before, when permalinks were created, they were using the rule dictated by the post type where the post was indexed in ES.  

For example: if we have two post types, /a/ and /b/.  We want to include a few of the /a/ posts in /b/, but their permalinks are showing up as /b/slug even though they are of type /a/.

Now if you send a 'type_for_url' into the hit_dict, the permalink will reflect the proper type.