Bumps dep link: reprounzip-vistrails

reprounzip only loads plugins from the 'reprounzip.plugins' entry point
since this version.
showfiles prints paths without -v
Only 'vagrant up' if machine is not up

First try 'ssh-config'; if that fails, call 'up' and try again.

This also means that 'upload' and 'download' commands now also start the
VM if needed, like 'run' does.
Better error message if 'vagrant' is unavailable

Only for setup/start
Better error message if 'docker' is unavailable

Only for setup/build