RFS: ocaml-gen 0.5-1

[Andy Li <andy@onthewings.net>]

Hi,

I've just updated ocaml-gen for the latest upstream release (0.5) in alioth.
The upstream changelog can be found at
https://github.com/c-cube/gen/blob/master/CHANGELOG.md#05
Would you review and upload it?

Best regards,
Andy