Add missing csrf_meta_tags helper

http://api.rubyonrails.org/v3.2.13/classes/ActionView/Helpers/CsrfHelper.html#method-i-csrf_meta_tags

> I was getting a ActionController::InvalidAuthenticityToken destroy
  error when using the Destroy method in my Rails 3 app. Turns out, when
  I was migrating to Rails 3, I forgot to include this in the html
  header.
  – http://therailworld.com/posts/34-ActionController-InvalidAuthenticityToken-with-Destroy-action
Add AdminSpamAddressesController and UI