title: Firebase authentication not working as expected
body: <p>I'm following along with the firebase docs about anonymous authentication, but I must be missing something.</p>
  
  <p>Here is my attempt at authenticating:</p>
  
  <pre><code>var dataRef = new Firebase('https://myfirebaseurl.firebaseio.com');
  // Log me in
  dataRef.authAnonymously(function(error, authData) {
    if (error) {
      console.log('Login Failed!', error);
    } else {
      console.log('Authenticated successfully with payload:', authData);
    }
  });
  </code></pre>
  
  <p>The result is that I get a 'TypeError: undefined is not a function' message because 'authAnonymously()' is supposedly not defined.</p>
  
  <p>I have '<strong>Enable Anonymous User Authentication</strong>' checked for my firebase though... and I don't know what else would keep this from being an option. Is it not offered in the 'Hacker' version?</p>
  
  <p>I am running this locally, so it shouldn't be a domain permissions issue since 'localhost' is included in the default accepted domains.</p>