fix(controller/tests): run coverage with "--timid" flag

Running controller tests through the venerable coverage.py tool
raises some errors during cleanup, as we seem to have dangling
PostgreSQL sessions. Adding the "--timid" flag works around this.

Fixes #727.

Author: mboersma

Makefile

@@ -41,7 +41,7 @@ db:
 	python manage.py syncdb --migrate --noinput
 
 coverage:
-	coverage run manage.py test --noinput api web
+	coverage run --timid manage.py test --noinput api web
 	coverage html
 
 flake8: