title: PHP TwitterOAuth account/verify_credentials returning 401
body: <p>I'm using abraham's twitter oauth class (https://github.com/abraham/twitteroauth) to connect and update twitter. I had it working during testing but now I'm trying to put it onto my live server I'm getting a 401 Could Not Authenticate error.</p>
  
  <p>The original connection works ok (200 response) but when I use <code>$connection-&gt;get('account/verify_credentials');</code> it just 401's and says it cannot authenticate.</p>
  
  <p>From looking at the $connection object, the [consumer] callback_url property is blank. Could this be the problem?</p>
  
  <p>Cheers</p>