added tearDown to test_delete_app.py
safeguard the tearDown on test_delete_app.py
fix for APP_INSTALLED define in test_delete_app.py
shifted APP_INSTALLED assignment in test_delete_app.py
shifted other APP_INSTALLED assignment in test_delete_app.py
include constants in class definition
Merge pull request #591 from AaronMT/589

added tearDown to test_delete_app.py