Add TestModel in models.py (needed by auto_patterns_for_app)
Fix content types filter in auto_patterns_for_app, delete
auto_patterns_for_model (useless)

+ remove coverage for unreachable code
Add test view for tests.models.TestModel
Move AutoPatternsMixinTestModel and NoViewsAutoPatternsMixinTestModel to setUp()
Add test for auto_patterns_for_app (AutoPatternsForAppTestCase)