Eugen Rochko f52c988e12
Add announcements ()
* Add announcements

Fix 

* Add reactions to announcements

* Add admin UI for announcements

* Add unit tests

* Fix issues

- Add `with_dismissed` param to announcements API
- Fix end date not being formatted when time range is given
- Fix announcement delete causing reactions to send streaming updates
- Fix announcements container growing too wide and mascot too small
- Fix `all_day` being settable when no time range is given
- Change text "Update" to "Announcement"

* Fix scheduler unpublishing announcements before they are due

* Fix filter params not being passed to announcements filter
..
v1 Add announcements ()
v2 Add more granular OAuth scopes ()
web Lint pass ()
base_controller_spec.rb Change unconfirmed user login behaviour ()
oembed_controller_spec.rb Remove Atom feeds and old URLs in the form of `GET /:username/updates/:id` ()
proofs_controller_spec.rb Fix base64-encoded file uploads not being possible ()