title: BOX iOS SDK SAMPLE APP: issue in cloning the folder
body: <p>I caught with the following error when i tried to clone the box sample application through terminal and here is the website where i downloaded <a href="https://github.com/box/box-ios-sdk-sample-app" rel="nofollow">https://github.com/box/box-ios-sdk-sample-app</a> </p>
  
  <p>TERMINAL ERROR:</p>
  
  <p>Vinods-Mac-mini:box-ios-sdk-sample-app vinodramanathan$ git submodule update</p>
  
  <p>Cloning into 'vendor/BoxSDK'...</p>
  
  <p>Warning: Permanently added the RSA host key for IP address '192.30.252.130' to the list of 
  known hosts.
  Permission denied (publickey).
  fatal: Could not read from remote repository.</p>
  
  <p>Please make sure you have the correct access rights
  and the repository exists.
  Clone of 'git@github.com:box/box-ios-sdk-private.git' into submodule path 'vendor/BoxSDK' failed</p>