reworking to use INT0 and PCINT18
cleaned up pin-change example, started up on fancy timer applications
renaming, trimming demo
streamlined.  button now resets all LEDs
streamlined more.  no button.
cleaning up reaction timer directory
refactoring reaction time into reactiontime.c and support file
stuff on clocks and timers.  not sure about it all.
was an attempt to get real-time out of internal oscillator.  mostly failed.
framework of rot13, but no code
more comments in reactionTimer support functions
renamed IO to support to better reflect what it actually does