Merged airspeed changes
Merged voltage compensation
Included raw differential pressure field
Update airspeed calibration routine to account for new signedness options
Merge branch 'master' of github.com:PX4/Firmware into airspeed_scaling
airspeed: Prevent the filter from overshooting into the negative airspeed range
Merge branch 'airspeed_scaling' of github.com:PX4/Firmware into airspeed_scaling
Merge branch 'master' into airspeed_scaling
Add celsius air temperature field to airspeed
Log air temperature
Populate air temperature field
Merge pull request #803 from PX4/airspeed_scaling

Airspeed scaling