/**
* Gets a Lookup object.
*
* Requires configuration to be made with a lookup path to a json containing
* a lookup table.
*
* @return KiTT_Lookup
*/
public static function lookup()
{
if (self::$_lookup === null) {
self::$_lookup = new KiTT_Lookup(self::configuration(), self::vfs());
}
return self::$_lookup;
}