Merge branch 'archlinux' of https://github.com/thomasgubler/Firmware
Merge branch 'master' of https://github.com/PX4/Firmware
reverting position estimator to master (removing a quick hack)
use groundspeed for now as the diff. pressure sensor is unreliable
Merge branch 'master' of https://github.com/PX4/Firmware
very simple gps simulation
Merge branch 'gps_simulate' into fw_control_flight
very simple gps simulation
merge of gps_simulate into fw_control_flight
Fix gyro measurement noise variance
Hotfix missing yaw deadzone default (leads to continuous turns since zero speed is never commanded)
Merge branch 'master' of https://github.com/PX4/Firmware into fw_control_flight
smal bugfix and removing printf