script for upgrading to comment.entity+comment.eid format
use comment.entity+comment.eid format on backend
adapt frontend comment model to new db format
Merge branch 'entity-comments-2'

http://questhub.io/realm/meta/quest/51edabfa18ba7d3759000025, stage 2
comments.entity and comments.eid fields replace the old
comments.quest_id field
rebuild static