Updated for designtra.in

Subtracts 's' from key if only 1. Therefore, instead of displaying "1
months" or "1 days" will only display "1 month" or "1 day"
Merge branch 'master' of https://github.com/ericdiviney/MidnightCountdownJS
Updated for deisgntra.in

Now, if hour is only 1 will display "1 hour" instead of "1 hours"