commented makefile (a bit) support for BOARD and SHIELD makefile params factored out compiler defines
commented makefile (a bit)
support for BOARD and SHIELD makefile params
factored out compiler defines

BrewPi/firmware,etk29321/firmware,etk29321/firmware,BrewPi/firmware,etk29321/firmware,BrewPi/firmware,glibersat/firmware,glibersat/firmware,etk29321/firmware,BrewPi/firmware,BrewPi/firmware,etk29321/firmware,etk29321/firmware,glibersat/firmware,BrewPi/firmware,glibersat/firmware,glibersat/firmware,BrewPi/firmware,BrewPi/firmware,glibersat/firmware,glibersat/firmware