Fixes #607, adds test for --log-level cmdline arg usage (#608)
Fixes #607, adds test for --log-level cmdline arg usage (#608)

test-logging.js

added test to confirm --log-level command line arg works across the range of LoggingSeverities
Fixes #607
RobotWebTools/rclnodejs,RobotWebTools/rclnodejs,RobotWebTools/rclnodejs,RobotWebTools/rclnodejs,RobotWebTools/rclnodejs