Merged status changes

src/drivers/bma180/bma180.cpp

src/drivers/drv_accel.h

src/drivers/drv_baro.h

src/drivers/drv_gyro.h

src/drivers/drv_mag.h

src/drivers/drv_range_finder.h

src/drivers/ets_airspeed/ets_airspeed.cpp

src/drivers/hmc5883/hmc5883.cpp

src/drivers/l3gd20/l3gd20.cpp

src/drivers/lsm303d/lsm303d.cpp

src/drivers/mb12xx/mb12xx.cpp

src/drivers/meas_airspeed/meas_airspeed.cpp

src/drivers/mpu6000/mpu6000.cpp

src/drivers/ms5611/ms5611.cpp

src/drivers/px4io/px4io.cpp

src/modules/px4iofirmware/registers.c

src/modules/systemlib/perf_counter.c

src/modules/systemlib/perf_counter.h

src/modules/uORB/objects_common.cpp

src/modules/uORB/topics/differential_pressure.h