Per current default install instructions; as this is appended to either
the per-interactive-shell startup file or aliases file, if Docker is not
installed or is not found, without this fix, the end-user will either be
effectively locked out of their session (after logging out) or they will
not be able to start a new shell within their current session...
- Re-enables space after completion for plugin arguments
- Ignores internal/implementation files when completing
* Files must be within an 'internal'/'impl' directory
- `dfi` is now primary unified command (saves fingers)
* `docker-finance` is still available, as this is only an addition
- Also fixes missing line continuation during install (#104)