18F/myusa — pull request #424 by cpapazian (2014-10-22 19:57:19+00:00)
Title: Add an unsubscribe link to notification emails

needs polish ... but almost there.

- create an UnsubscribeToken class that works similar to AuthenticationToken
- create notifications/unsubscribe route to handle unsubscribe action
- add unsubscribe link to mailer with email and raw token for authentication