Merge remote-tracking branch 'upstream/master'

mavlink/include/mavlink/v1.0/mavlink_conversions.h

src/drivers/gps/ubx.cpp

src/drivers/mpu6000/mpu6000.cpp

...es/attitude_estimator_ekf/attitude_estimator_ekf_params.c

src/modules/gpio_led/gpio_led.c

src/modules/systemlib/cpuload.c

src/systemcmds/top/top.c