start adding canon of pachelbel
Add 3rd voice, various syncing improvements
Removed unnecessary stuff, add fixed version of 2nd voice
Added code to wait for pin 2 to be set LOW
NOTE_B0 will not be played (quick fix, could be made more elegant)
Fixed a small error
Removed NOTE_B0 handling because it didn't work...
Some more cleanup, add voice 3
Merge branch 'canon' of github.com:HopelessProgrammingInterns/arduino-canon-pachelbel into canon

Conflicts:
	ChristmasMelody/ChristmasMelody.ino
Various fixes included, had to cut down voice 2 and 3 to stay within
the memory limit
Remove things that don't belong here