Merge branch 'netduino2.2' into netduino2.dev

Signed-off-by: Alistair Francis <alistair23@gmail.com>

Conflicts:
	hw/arm/armv7m.c
	hw/arm/stellaris.c
	hw/char/stm32f205_usart.c
	hw/timer/stm32f205_timer.c
	include/hw/char/stm32f205_usart.h
	include/hw/timer/stm32f205_timer.h