OK - so I have to admit I *hate* the fact that PIP seems to require a
subdirectory named like the library.
But since the PIP package is something really nifty to have (thanks to
@tony again!!!), I updated the codebase to hopefully conform with what
PIP expects. Testruns so far look promising...
When the docker daemon is not running, only the call to
containers.list() actually throws an exception, so move that into the
exception guard.
fixes#608
