Optionally set a cutoff message.

Displaying a lot of dates together and using the cutoff setting produces a very inconsistent look. (Some are words, some are dates) This will allow you to benefit from the cutoff feature, but have everything in words.

If you set the cutoffMessage setting to a string, that string will
be displayed before the text version of your cutoff date.
e.g.: {cutoffMessage: "over", cutoff: 7*24*60*60*1000} will produce
"over 7 days ago".