allow option for showing of "0" on countdown

[sneakernets]

Currently if a unit of time has 0 (as in, 0 minutes or 0 seconds) but has a larger unit behind it, that unit disappears.

example:

30d 9h 1m
30d 9h 59s

a more desirable look could be:

30d 9h 1m 0s
30d 9h 0m 59s