add function to create directories recursively about goftp

[muirmanders]

Thank you for the suggestion. I want to keep the client API simple (i.e. close correspondence to the actual FTP commands). I would be open to a separate package "ftputil" (a la "ioutil") or similar that has these kinds of useful functions. The signature could be something like MkdirAll(*goftp.Client, string) (string, error) ("MkdirAll" is consistent w/ std lib naming).

[GlenDC]

That sounds like a reasonable approach to me. In the course of the next week I'll try to allocate some time and open a PR for it, so we can take it from there.

[muirmanders]

Closing due to inactivity. Please re-open if you want to keep working on this.