Remove UserFirst table and grant Emoji badge directly

db/fixtures/006_badges.rb

@@ -379,7 +379,7 @@ Badge.seed do |b|
   b.multiple_grant = false
   b.target_posts = true
   b.show_posts = true
-  b.query = BadgeQueries.has_user_first(:used_emoji)
+  b.query = nil
   b.badge_grouping_id = BadgeGrouping::GettingStarted
   b.default_badge_grouping_id = BadgeGrouping::GettingStarted
   b.trigger = Badge::Trigger::PostProcessed

db/migrate/20160407160756_remove_user_firsts.rb

@@ -0,0 +1,5 @@
+class RemoveUserFirsts < ActiveRecord::Migration
+  def up
+    drop_table :user_firsts
+  end
+end