Ranger now supports ROS :-)
[nav] Use ROS move_base to implement the 'goto' action
Use strings to identify the beacons' frames

This prevent issues when normalizing poses
[attitutes] New attitude 'lost'

While here, updated 'blink' to pass the desired number of blinks
Fixed a bug that would set state.eyelids to (None, None)

The symptom was: a blink starts, but the eye never re-opens
[demos] Updated croquignole_baseline with correct event type and new event callbacks