Add poll question answers script for nested fields

Set poll questions answers given_order value dinamically with JS to
allow to create multiple answers with correct given_order.

app/assets/javascripts/answers.js.coffee

@@ -0,0 +1,9 @@
+App.Answers =
+
+  nestedAnswers: ->
+    $('.nested-answers').on 'cocoon:after-insert', (e, insertedItem) ->
+      nestedAnswersCount = $("input[type='hidden'][name$='[given_order]']").size()
+      $(insertedItem).find("input[type='hidden'][name$='[given_order]']").val(nestedAnswersCount)
+
+  initialize: ->
+    App.Answers.nestedAnswers()

app/assets/javascripts/application.js

@@ -59,6 +59,7 @@
 //= require markdown-it
 //= require markdown_editor
 //= require cocoon
+//= require answers
 //= require legislation_admin
 //= require legislation
 //= require legislation_allegations
@@ -87,6 +88,7 @@
 //= require send_admin_notification_alert
 
 var initialize_modules = function() {
+  App.Answers.initialize();
   App.Comments.initialize();
   App.Users.initialize();
   App.Votes.initialize();