HMC5883: Do not spam the console on error and make everything worse.
airspeed driver: Do not spam the console on error, report the system change only once
airspeed: Let the status check routine handle the initial state
sensors: Keep looping in sensors app even if gyros do not update any more. There are lots of other reasons we might want to keep clocking the system. This resolves the RC timeout dependency in HIL.
add parameter to mavlink app to allow parsing of HIL GPS message even if not in HIL mode

Conflicts:
	src/modules/mavlink/mavlink_receiver.cpp
filter gps simulation hil gps message with sysid
add tags file to .gitignore
Merge pull request #862 from thomasgubler/gitignore_tags

add tags file to .gitignore
remove tags file
Merge pull request #860 from PX4/vicongpssimulation

Indoor gps simulation mode
Merge pull request #843 from PX4/sensor_err_handling

Sensor error handling
launchdetector: fix copyright header
Merge pull request #867 from PX4/launchdetector_copyright

launchdetector: fix copyright header
Merge pull request #852 from PX4/sensors_loop

sensors: Keep looping in sensors app even if gyros do not update any mor...
Merge remote-tracking branch 'px4/master' into navigator_cleanup