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
Ensure MAVLink app has enough stack space
Remove huge memory overhead in RC channels topic, was completely unnecessary
Encoder logging support.
Shortened encoder logging names.
Update NuttX, print stack trace on stack overflow handler
Merge branch 'master' of github.com:PX4/Firmware
Commander: Improve calibration routines to produce more conscise and better sequenced instructions
Time out on serial instead of just hanging there
Merge pull request #1424 from PX4/cal_usability

Commander: Improve calibration routines to produce more conscise and bet...
Fix error handling
Merge pull request #1422 from jgoppert/encoder_logging

Encoder logging support.