Code to verify that conveyor can verify that a MakerBot machines is plugged in.
Code to verify that conveyor can verify that a MakerBot machines is plugged in.

modified:   src/main/python/conveyor/client/__init__.py
* _initsubparser_verify_usb_detect: Command line parser for the verify_usb_detect flag.
* _verify_usb_detect: Start of the code for the verify USB detection code.  The actual commands that list the printers are commented out so that the script should work until this build is merged into the release branch.

makerbot/conveyor,makerbot/conveyor,makerbot/conveyor,makerbot/conveyor