Stopped motors from running on no input
Stopped motors from running on no input

Set so that motor values are zero unless PWM input is close to the desired range, so that unplugged wires don't cause motors to
go to max value.

huskyroboticsteam/2014-15,huskyroboticsteam/2014-15,lolisa/2014-15,huskyroboticsteam/2014-15,lolisa/2014-15,lolisa/2014-15