Quick improvement to cuff code.

I misunderstood the documentation for round() because I'm an idiot, but upon thinking upon it today I realized that I could make it actually round to 0.5s instead of full numbers. 

Additionally, this should prevent cuffs with low breakouttimes (only cablecuffs AFAIK) from having their message changed to 'it will take around 1 minutes', which makes it seem like the timers were increased.
Merge pull request #155 from scrdest/patch-5

Quick improvement to cuff code.