Makes it possible to switch off FORCE_DB by setting to 'false'. Otherwise, the only way to disable it after having set it once is to use ``FORCE_DB= ./manage.py test ...`` which isn't great. 
Makes it possible to switch off FORCE_DB by setting to 'false'. Otherwise, the only way to disable it after having set it once is to use ``FORCE_DB= ./manage.py test ...`` which isn't great. 
jbalogh/test-utils