Summary:
- Publish feed/notification.
- I think this is too lightweight for an email?
- We don't tell them which token right now. Laziness? Or intentional aura of mystery?!
- For tasks, notify both author and current owner.
- Fixes T2562.
Test Plan: {F33187}
Reviewers: chad
Reviewed By: chad
CC: aran
Maniphest Tasks: T2562
Differential Revision: https://secure.phabricator.com/D5007
