title: Rails upgrade to 4.1.12 causes ActiveAdmin crash
body: <p>We have an app that we're upgrading from Rails 3.2.x to 4.1.x.  After much tweaking, the app runs now, but trying to load the ActiveAdmin dashboard, we get this error:</p>
  
  <pre><code>Showing /Users/xxx/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activeadmin-1.0.0.pre1/app/views/active_admin/page/index.html.arb where line #2 raised:
  
  undefined method `call' for #&lt;Pano::ActiveRecord_Relation:0x007fd869a3c138&gt;
  Extracted source (around line #2):
  1
  
    insert_tag active_admin_application.view_factory["page"]
  
  Rails.root: /Users/xxx/Google Drive/Code/xxxx/xxxx-rails
  </code></pre>
  
  <p>The code that is causing the crash is in the ActiveAdmin code itself:</p>
  
  <p>/Users/xxxx/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activeadmin-1.0.0.pre1/app/views/active_admin/page/index.html.arb</p>
  
  <p>I'm not sure what I'm missing here, can anyone potentially point me in the right direction?</p>