title: How to get unique user ID for HockeyApp?
body: <p>In the HockeyApp SDK v. 3.5, they have shifted to a new method of user identification. In previous versions of the SDK, there was a callback method <code>- (NSString*)userNameForCrashManager:(BITCrashManager *)crashManager</code> which would set a string which would identify all crash reports sent from the client.</p>
  
  <p>However, in version 3.5 of the SDK, it seems that this is deprecated, and it is preferred that you simply call:</p>
  
  <pre><code>[[BITHockeyManager sharedHockeyManager].authenticator authenticateInstallation];
  </code></pre>
  
  <p>This sets a unique ID for the user. But how can I access this identifier? I want to attach it to support emails so that I can search for crash reports the user has submitted.</p>