Rizmari Versfeld

[resize_image](https://github.com/praekelt/django-photologue/blob/develop/photologue/models.py#L359) needs to be modified so that GIF animations are preserved.

Using `usize` for dataset size and derived values causes an overflow error for 32-bit build targets, e.g. WASM. As an aside, https://github.com/rust-ethereum/ethash/pull/10 would have made this bug trivial to discover...