Change dev/test database user to "postgres"

Instead of having different users with passwords for dev and test
environments we unify into one password-less user: "postgres". This
might mean that you have to change to use "trust" authentication levels
on your local postgresql server. To do that:

  1. Locate your pg_hba.conf file
  2. Change "md5" to "trust"
  3. Restart the postgresql server

You might also have to add a "postgres" user (on my system however, this
user already existed).
Create database before Travis specs are run

This should hopefully resolve the build failures we're getting from our
Travis build.