README clarification for database setup

I followed the original README, but I was getting an error: "could not find module './config'

After checking out the files, I figured out what I needed to do from reading the `config.TEMPLATE.js` and `populateDBCopy.js` files.

So I added some instructions in the README for clarifying that part of the setup, and made a slight modification to the db script.  It would help the next layman like me to quickly get this great project up and running!  Thanks for making it.