Fixed Compile errors
Added main loop and code to test wakeup on interrupt
Added sensitivity to interrupt
Compiling memory test. Not tested.
Merge branch 'master' of https://github.com/timburke/welldone-nozzle

Conflicts:
	command_handlers.c
	main.c
SPI communication first draft

Debug messages added
Merge branch 'tim' into austin_gsm

Conflicts:
	command_handlers.c
	main.c
Rename gsm_commands to gsm
Clean some stuff up, move GSM code to a modular and interface-agnostic location, start moving project defines to common.h so code doesn't hurt the brain organ as much.  Aliased sends(U2,msg) to pring(msg).
Remove the LED command because we no longer have an LED.
Merged in austin_gsm branch