* Process incoming poll tallies update
* Send Update on poll vote
* Do not send Updates for a poll more often than once every 3 minutes
* Include voters in people to notify of results update
* Schedule closing poll worker on poll creation
* Add new notification type for ending polls
* Add front-end support for ended poll notifications
* Fix UpdatePollSerializer
* Fix Updates not being triggered by local votes
* Fix tests failure
* Fix web push notifications for closing polls
* Minor cleanup
* Notify voters of both remote and local polls when those close
* Fix delivery of poll updates to mentioned accounts and voters
> Good lord what is happening in there
Previously the contents of the Web Push API payloads closely resembled the structure of JavaScript's [Notification](https://developer.mozilla.org/en-US/docs/Web/API/Notification). But now that the API is open to non-browser apps, and given that there is no required coupling between contents of the payload and a Notification object, here is how I changed the payload:
```json
{
"access_token": "...",
"preferred_locale": "en",
"notification_id": "12345",
"notification_type": "follow",
"title": "So and so followed you",
"body": "This is my bio",
"icon": "https://example.com/avatar.png"
}
```
The title, body and icon attributes are included as a fallback so you can construct a minimal notification if you cannot perform a network request to the API to get more data.
