Merge pull request #413 from OpenTechFund/feature/252-mailgun-logging

opentech/apply/activity/__init__.py

opentech/apply/activity/admin.py

opentech/apply/activity/apps.py

opentech/apply/activity/messaging.py

...ech/apply/activity/migrations/0008_message_external_id.py

opentech/apply/activity/models.py

opentech/apply/activity/signals.py

opentech/apply/activity/tasks.py

...pply/activity/templates/messages/email/determination.html

opentech/apply/activity/tests/factories.py

opentech/apply/activity/tests/test_messaging.py

opentech/apply/activity/tests/test_tasks.py

opentech/apply/activity/urls.py

opentech/apply/determinations/models.py

opentech/apply/determinations/views.py

opentech/apply/urls.py

opentech/apply/utils/options.py

opentech/settings/base.py

requirements.txt