Use "script/setup" in CI

.travis.yml

@@ -39,14 +39,8 @@ before_install:
   - sudo mv geckodriver /usr/local/bin/
   - geckodriver --version
 
-install:
-  - bundle install --jobs=3 --retry=3
-  - bundle exec rake yarn:install
-
-before_script:
-  - psql -U postgres -c "CREATE DATABASE partynest_test;"
+install: script/setup --initial
 
 script: bundle exec rake all
 
-after_script:
-  - bundle exec rake coveralls:push
+after_script: bundle exec rake coveralls:push