Make `twigg <subcommand> -h` emit the right help
Make `twigg <subcommand> -h` emit the right help

As we were passing `*args` here, that meant that an invocation like:

  twigg russian -h

Would actually invoke the Help class with `-h` as args, although what we
actually wanted was to show the "russian" subcommand help.

Change-Id: I143ff517d4ddbe876c76faf6075e54a01620b0aa
Reviewed-on: https://gerrit.causes.com/26640
Reviewed-by: Greg Hurrell <79e2475f81a6317276bf7cbb3958b20d289b78df@causes.com>
Tested-by: Greg Hurrell <79e2475f81a6317276bf7cbb3958b20d289b78df@causes.com>

causes/twigg,causes/twigg