Merge branch 'master' of github.com:PX4/Firmware

ROMFS/px4fmu_common/init.d/rc.FMU_quad_x

ROMFS/px4fmu_common/init.d/rc.IO_QUAD

ROMFS/px4fmu_common/init.d/rc.PX4IO

ROMFS/px4fmu_common/init.d/rc.PX4IOAR

ROMFS/px4fmu_common/init.d/rc.hil

makefiles/firmware.mk

src/drivers/px4io/px4io.cpp

src/modules/commander/commander.c

src/modules/commander/state_machine_helper.c

src/modules/px4iofirmware/mixer.cpp

src/modules/px4iofirmware/protocol.h

src/modules/px4iofirmware/registers.c

src/modules/px4iofirmware/safety.c

src/modules/uORB/topics/actuator_controls.h