Károly Oláh

Then why it hasn't been dropped yet?... This is a nice light-weight image lib (just what i was looking for), but now I must alter it to use. It's completely...

Also, `Tpl::$conf['registered_tags']` is not used anywhere in the code. Deprecated?

The callback hashing is not trivial, but spl_object_hash is a solution (something like [this](https://github.com/morrisonlevi/PHP-Datastructures/blob/master/src/Spl/HashingMediator.php#L41) ) I could propose a pull request, but I'm not so familiar with the very recent...