Secure product_categories and add example test for other supplier resources and fix hack attempts included in test

app/controllers/application_controller.rb

@@ -1,10 +1,9 @@
 class ApplicationController < ActionController::Base
   before_filter :set_locale
   layout :layout_by_resource
-  
-  
   protect_from_forgery
 
+  rescue_from SimplyStored::RecordNotFound, with: :show_404
 private
 
   def broadcast_user(uid, event, data = {})
@@ -62,4 +61,8 @@ private
     "http://#{Rails.env.production? ? 'events.qwaiter.com' : 'localhost'}:9296/faye"
   end
   helper_method :event_host
+
+  def show_404
+    render 'dashboard/404', layout: true, status: 404
+  end
 end