Added current time and time remaining (issue #11)

It was impossible to put both oriented left without messing with other
things (because HTML) so the remaining time is centered. Manan does not
like the time remaining in the period but I think it’s nice. People
like countdowns. Countdowns are good.
Merge branch 'dev' of https://github.com/HarkerDev/bellschedule

Conflicts:
	script.js