refactors stats and optimizes js

JS libraries for stats (d3, c3, etc.) only load now when needed (stats/show)

app/assets/javascripts/application.js

@@ -15,21 +15,32 @@
 //= require foundation
 //= require turbolinks
 //= require ckeditor/init
+//= require_directory ./ckeditor
 //= require social-share-button
 //= require initial
 //= require ahoy
-//= require d3
-//= require c3
-//= require c3ext
 //= require app
-//= require_tree .
+//= require check_all_none
+//= require comments
+//= require dropdown
+//= require ie_alert
+//= require location_changer
+//= require moderator_comment
+//= require moderator_debates
+//= require moderator_proposals
+//= require prevent_double_submission
+//= require rem.min
+//= require respond.min
+//= require tags
+//= require users
+//= require votes
+
 
 var initialize_modules = function() {
   App.Comments.initialize();
   App.Users.initialize();
   App.Votes.initialize();
   App.Tags.initialize();
-  App.Stats.initialize();
   App.Dropdown.initialize();
   App.LocationChanger.initialize();
   App.CheckAllNone.initialize();

app/assets/javascripts/stat_graphs.js

@@ -0,0 +1,15 @@
+//= require d3
+//= require c3
+//= require c3ext
+//= require stats
+
+var initialize_stats_modules = function() {
+  App.Stats.initialize();
+};
+
+$(function(){
+
+  $(document).ready(initialize_stats_modules);
+  $(document).on('page:load', initialize_stats_modules);
+  $(document).on('ajax:complete', initialize_stats_modules);
+});