add projects app tests, admin panel, rename clean_media command

README.md

core/management/commands/cleanmedia.py

core/management/commands/populatedb.py

core/tasks.py

oser_backend/settings/production.py

projects/admin.py

projects/apps.py

projects/factory.py

projects/migrations/0002_auto_20180606_2329.py

projects/models.py

projects/tests.py

projects/utils.py

tests/test_core/test_clean_media.py

tests/test_core/test_tasks.py

tests/test_projects/__init__.py

tests/test_projects/test_project.py

tests/test_projects/test_utils.py