Added a default database file so passwords don't have to be in the repo

Just an idea to put the database information in a separate config file that doesn't have to be stored in the repository so you can put passwords in it. This would require that you copy the `database.js.default` to `database.js` before running the app. If we do want to do this, we could also add a section for the `dbOptions` key to the `database.js` file.