Better test for integration.

.travis.yml

@@ -31,3 +31,6 @@ script:
     | grep -q 'changed=0.*failed=0'
     && (echo 'Idempotence test: pass' && exit 0)
     || (echo 'Idempotence test: fail' && exit 1)
+
+  # Check if we get an installation page.
+  - curl http://localhost:3000/install