function to print timedeltas exactly

[chrisnorman7]

Hi,
I find myself using a function regularly that prints a time delta as "4 hours, 3 minutes, and 15.3 seconds". Is this a function you'd be interested in adding to your library?

I'd rather add it to a common library rather than copy and pasting it the whole time.

If you want it I'll open a PR with the requisite code.

Cheers,

Chris

[timc13]

It would be great if the function could take a precision argument ("minutes", "seconds", "hours") so that we could return "4 hours, 3 minutes" if we specify the "minutes" precision and don't care about the seconds.

[chrisnorman7]

Hi,
I just submitted a PR #57 with the alterations you suggested.