500hz with sdlog app

Conflicts:
	ROMFS/px4fmu_common/init.d/rc.logging
	src/modules/sdlog/sdlog.c
	src/modules/sdlog/sdlog_ringbuffer.h
	src/modules/sensors/sensors.cpp
no filters, 16g range

Conflicts:
	src/drivers/lsm303d/lsm303d.cpp
Setup for serial console read of data
Sensors: use _RC_INPUT_MAX_CHANNELS