[helpers] distance_of_time_in_words Months? Weeks?

[Clam-]

Do we want to add "months" and "weeks" to util.helpers.distance_of_time_in_words ?
At the moment if someone does something like .remind me in 3months do stuff it'll say:
I will remind you about that in 88 days, 14 hours and 12 minutes.
Do we want to add more coarse units?