Feature: Unlisted custom emojis (#5485)

db/migrate/20171020084748_add_visible_in_picker_to_custom_emoji.rb

@@ -0,0 +1,7 @@
+class AddVisibleInPickerToCustomEmoji < ActiveRecord::Migration[5.1]
+  def change
+    safety_assured {
+      add_column :custom_emojis, :visible_in_picker, :boolean, default: true, null: false
+    }
+  end
+end