Add filter to limit posts on zone

[cojennin]

Added filter 'zoninator_post_count_limit' to limit the number of posts that can be added to a zone. Pass the zone_id to determine which zone you want to limit the number of posts for. A filter could look something like this:
add_filter('zoninator_post_count_limit', 'limit_number_of_posts', 10, 1);

function limit_number_of_posts($zone_id) {
    switch($zone_id) {
        case '2':
            return 1;
        break;
    }
}

0 allows any number of posts to be added to a zone. Greater than 0 means that that many posts can be added to a zone. Didn't add the capability to not add posts to a zone, but that could be implemented.

[mjangda]

Thanks @cojennin! The patch looks good; I'll do some tests + merge.

[GaryJones]

The theory looks good but needs an investigation to resolve the conflicts.