driver for the TeraRangerOne I2C ranger finder
update attitude_estimator_ekf, includes matlab

This adds the latest c implementation (matlab coder) of
attitude_estimator_ekf, the .m matlab script and the .prj file with the
settings to export the matlab code to c
Merge remote-tracking branch 'upstream/master' into attitudeekf
att ekf: add param to enable/disable J
att ekf: add descriptions for params
Merge remote-tracking branch 'upstream/master' into attitudeekf
Merge remote-tracking branch 'upstream/master' into attitudeekf
Merge remote-tracking branch 'upstream/master' into attitudeekf
update attitude estimator ekf to latest version

mainly saves stack size
ORB topic for drive testing requests
cmd line utility for controlling drive tests
Ashtech GPS driver
Merge branch 'master' into ashtech
Increased ashtech POS frequency and increased baudrate
Fixed km/h -> knots in POS
Merge branch 'ashtech' into ashtech_hi_freq
PASHS,POP,20 is needed for 20Hz configuration
Merge branch 'master' into ashtech_hi_freq
Corrected gps_fix values description
Code style fix