Use .twitter() over a moment.js duration

[decklord]

It would be awesome that the following code would work:

moment.duration(secondsInterval, 's').twitter()

I just have a seconds interval.

[hijonathan]

Great idea! Would you be interested in sending a PR? If not, I can try to get to it in the next couple of weekends.

In the meantime, a workaround would be to simply do something like this:

moment().subtract(secondsInterval, 's').twitter()

[hijonathan]

On second thought, doing it that way is probably a more elegant solution. What do you think?