Fix authorized users to programmatically fetch committers

[dhalperi]

From @Humbedooh

you can either do an ldap query or you can fetch the JSON files from whimsy like that http://home.apache.org/phonebook.html does

[dhalperi]

Whimsy: https://github.com/apache/whimsy/blob/191fad3ee9b9ed9fe26a3cd55a390840cf44fc5b/www/roster/main.rb#L56