Hotfix: Improved file test
Merge branch 'master' of github.com:PX4/Firmware
tone_alarm: add GPS warning tone
Enabling navigator, does not do anything useful yet
Fix the direction of the override switch for the new state machine
easystar startup script: load mixer from sd-card if available
Merge branch 'master' of https://github.com/PX4/Firmware
Merge branch 'master' into geofence