create the correct DB name for travis to match name in database.yml

.travis.yml

@@ -6,4 +6,4 @@ before_install:
   - "sh -e /etc/init.d/xvfb start"
 before_script:
   - cp config/database.yml.travis config/database.yml
-  - psql -c 'create database bike_bike_test;' -U postgres
+  - psql -c 'create database travis_ci_test;' -U postgres