ticket:4: merge fix
 t:10: added tests
ticket:10: implementation (signals.py imported in admin.py, model, migration)
ticket:3: modified test_top10_requests in hello42/tests
ticket:4: merge conflict fix with t3 (test requests and settings)
ticket:4: deleted settings from the template
ticket:5: merge fixes (settings, text)
ticket:5: invalid login and login test
ticket:5: simplified edit forms and editMain view
ticket:8: merge with fixed previous tickets
ticket:8: added tag tests
ticket:9: added tests for command 'model_count'