ThibG dfea7368c9 Add bookmarks ()
* Add backend support for bookmarks

Bookmarks behave like favourites, except they aren't shared with other
users and do not have an associated counter.

* Add spec for bookmark endpoints

* Add front-end support for bookmarks

* Introduce OAuth scopes for bookmarks

* Add bookmarks to archive takeout

* Fix migration

* Coding style fixes

* Fix rebase issue

* Update bookmarked_statuses to latest UI changes

* Update bookmark actions to properly reflect status changes in state

* Add bookmarks item to single-column layout

* Make active bookmarks red
..
v1 Add bookmarks ()
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 Add Keybase integration ()