Added --device flag to run reference

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
this should really be `      --device=[]                Add a host device to the container (e.g. --device=/dev/sdc:/dev/xvdc)` as it is in cli.md - or we should update the cli flags to be more helpful