dashboard: clean, improve models

dashboard/Dockerfile

dashboard/gepetto_packages/admin.py

dashboard/gepetto_packages/migrations/0001_initial.py

dashboard/gepetto_packages/migrations/0002_github.py

dashboard/gepetto_packages/migrations/0003_gitlab.py

dashboard/gepetto_packages/migrations/0004_redmine.py

dashboard/gepetto_packages/models.py

dashboard/gepetto_packages/templatetags/gepetto_packages.py

dashboard/gepetto_packages/tests.py

dashboard/gepetto_packages/utils.py

dashboard/gepetto_packages/views.py

dashboard/gepkg/settings.py

dashboard/manage.py