Do not show DeviceID in lists.

DeviceID is internal OpenLMI ID to identify block devices. It's quite long
and most admins will use '/dev/sda' (or just 'sda') anyway, so let's remove
it from all 'list' commands output.

'show' command will show it, if anybody is interested.
fixed parsing of command line options

Docopt parser needs to be given options_first which causes that all
arguments are treated a positional after the first positional is given.
This allows for commands nesting with hierarchical usage.

Multiplexer used wrong heuristic for determining its value.
Merge pull request #47 from jsafrane/devel/list-no-deviceid

Do not show DeviceID in lists.