ORB topic for drive testing requests
cmd line utility for controlling drive tests
drivers: allow forcing the safety switch on

This allows forcing the safety switch to the on position from software
which stops the pwm outputs
mpu6000: added logging of good transfers

this helps tracking down a startup issue
TECS: Fix bug (underspeed-condition did not have any effect on throttle)
Merge remote-tracking branch 'tridge/pullrequest-force-safety'
sdlog2_dump: Fixing incorrect tabbing to allow for CSV generation
TECS: Also deleted the _throttle_dem_unc variable from TECS.h
Merge pull request #1413 from philipoe/PR1

TECS: Fix bug (underspeed-condition did not have any effect on throttle)
Merge pull request #1326 from hsteinhaus/drive_testing

Drive testing interface and cmd line tool
Updated MAVLink revision
Merge branch 'master' of github.com:PX4/Firmware
Fix build breakage on mavlink update
Leave NSH terminal enough stack space
Don't go into an error state if we are temporarily powering via USB on the bench
Merge pull request #1416 from sjwilks/calibrate_usb

Don't go into an error state if we are temporarily powering via USB on the bench
Simplify error messages for NSH term
Configure led ring and enable heartbeat on it
Merge pull request #1421 from PX4/ledring

Configure led ring and enable heartbeat on it
Build fix