Created code to calibrate fading times

It seems that the times almost line up if you multiply the original k
value by 5.
First complete circuit

I will see if I can make it any smaller. The more of these chips I can
fit in a given space, the better.
Moved pot in by one grid mark
Updated circuit from build test, added sleep

Reduced power consumption in "off" mode from 1.28 mA to 0.31 mA using
sleep code found from
http://www.insidegadgets.com/2011/02/05/reduce-attiny-power-consumption-by-sleeping-with-the-watchdog-timer/