Setting a default password for postgres database

I had problem connecting to the postgres database when leaving out the password-field from the database yaml comfiguration file in my rails app.

I got this error when running `rake db:create`

`fe_sendauth: no password supplied`

Making the change i did in this pull-request fixed the issue for me once i updated the database configuration for the rails app.

How are you supposed to use the postgres database with the default rails-dev-box?