well_to_num vertical order

[zionlion77]

Dear Scott,

thanks for the great package. I would have a small suggestion for improvement of the package, namely to provide another style to the well_to_num function that allows for vertical (and maybe also vertical snake) order of numbering. I think this could be useful to other people as well and shouldn't be too painful to implement.

Cheers

[Swarchal]

That sounds like a good idea, I'll add it in the near future.