Matching test database name to exactly the postgres default in runtests.py.

.travis.yml

@@ -15,7 +15,7 @@ install:
   - pip install psycopg2
 # Pre-test configuration
 before_script:
-  - psql -c 'create database wagtaildemo_test;' -U postgres
+  - psql -c 'create database wagtaildemo;' -U postgres
 # Run the tests
 script: python runtests.py
 # Who to notify about build results