updated build_luggage_isu.sh to create luggage_isu database name and lug...

When using the script, I wanted to database name to match the repo "luggage_isu". I had also ran the luggage script on a separate luggage repo and wanted databases to be unique. This may be a piece of documentation for how to change the script to create your own unique db name, similar to how you described how to create your own repository.