add interrupt middleware

Makefile

contracts/admin.py

contracts/management/commands/import_old_contracts.py

contracts/management/commands/load_from_ico.py

...ations/0065_alter_signee_options_alter_contract_status.py

contracts/migrations/0066_alter_contractee_options.py

contracts/migrations/0071_signeehistoricalname.py

contracts/models.py

contracts/settings.py

package-lock.json

registry/middleware.py

registry/settings/base.py

registry/templates/closed.html

requirements/base.in

requirements/base.txt

requirements/production.in

requirements/production.txt