change list_tests to django_list_tests and list

only apps found in current directory not all
installed apps
remove unnecessary settings import
fix find_all_tests and add functional tests

Those tests make use of subprocess to call to
python scripts with some specific environment 
variables set.
fix find_all_tests and add functional tests

Those tests make use of subprocess to call to
python scripts with some specific environment 
variables set.
Merge branch 'feature/improve_django_integration' of https://github.com/loogica/neurotic into feature/improve_django_integration
fix fixture/dummy test