title: Laravel 5.2 TokenGuard implementation
body: <p>How to use token guard to create API? I tried it to implement it and I am getting error </p>
  
  <blockquote>
    <p>call_user_func_array() expects parameter 1 to be a valid callback,
    class 'Illuminate\Auth\TokenGuard' does not have a method 'attempt'</p>
  </blockquote>