title: ActiveAdmin uninitialized constant Twilio::REST::CLIENT
body: <p>Most likely a very  basic and simple question. But super happy if someone could help me out (:</p>
  
  <p>I am trying to include Twilio into Activeadmin. I took this code example from the very comprehensive Twilio tutorial.</p>
  
  <pre><code>ActiveAdmin.register Sms do
  ...
  controller do 
  def create 
   account_sid = "secret"
   auth_token =  "secret"
   client = Twilio::REST::CLIENT.new account_sid, auth_token
   from = "secret"
   client.account.messages.create(
    :from =&gt; from,
    :to =&gt; @customer[:phone],
    :body =&gt; @message[:text]
   )
  </code></pre>
  
  <p>But where can i tell AA to load the Twilio gem, e.g. where do i have to put the  <code>require twilio-gem</code> statement? I tried it everywhere in the <code>Sms.rb</code> file and i looked into the  <code>initializers/active_admin.rb</code> 
  but i cannot figure this out. Thanks for any help in advance.</p>
  
  <p>In my rails console everything is working fine and i am able to use this code without problems so its really hanging by the gem inclusion.</p>