Configure roles and permissions suitable for Travis auth feature specs

.travis.yml

@@ -2,12 +2,15 @@ language: haskell
 ghc: 7.8
 addons:
   postgresql: "9.3"
-before_script:
-  - psql -c 'create database dbapi_test;' -U postgres
 before_install:
+  - createuser --superuser --no-password dbapi_test
+  - createdb -O dbapi_test -U postgres dbapi_test
   - travis_retry sudo add-apt-repository -y ppa:hvr/ghc
   - travis_retry sudo apt-get update
   - travis_retry sudo apt-get install --force-yes happy-1.19.3 alex-3.1.3
   - export PATH=/opt/alex/3.1.3/bin:/opt/happy/1.19.3/bin:$PATH
+before_script:
+  - cabal configure --enable-tests
+  - cabal build
 script:
-  - cabal configure --enable-tests && cabal build && cabal test --show-details=always --test-options="--color"
+  - cabal test --show-details=always --test-options="--color"