Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
	app/models/status.rb
	db/migrate/20180528141303_fix_accounts_unique_index.rb
	db/schema.rb

Resolved by taking upstream changes (no real conflicts, just glitch-soc
specific code too close to actual changes).

app/serializers/rest/status_serializer.rb

@@ -3,7 +3,8 @@
 class REST::StatusSerializer < ActiveModel::Serializer
   attributes :id, :created_at, :in_reply_to_id, :in_reply_to_account_id,
              :sensitive, :spoiler_text, :visibility, :language,
-             :uri, :content, :url, :reblogs_count, :favourites_count
+             :uri, :content, :url, :replies_count, :reblogs_count,
+             :favourites_count
 
   attribute :favourited, if: :current_user?
   attribute :reblogged, if: :current_user?