added new simplshell commands progress, abort and help
Merge pull request #105 from wolfmanjm/feature/playprogress

added new simpleshell commands progress, abort and help
Merge branch 'edge' into track_allocs
commented the second usbserial to simplify life for new users
Merge pull request #108 from logxen/edge

commented the second usbserial to simplify life for new users
Merge branch 'edge' into track_allocs