Update name of sqlite db file in config/database.yml.example
Update name of sqlite db file in config/database.yml.example

This is the default Rails one, which people might be familiar with. I
don't know where I got the other one from. This also makes it work
better with the .gitignore file, which is set to ignore anything
matching "db/*.sqlite3".

kalw/diffux,diffux/diffux,diffux/diffux,kalw/diffux,diffux/diffux,kalw/diffux