title: Proguard and Google Analytics exporting apk issue
body: <p>When I try to export my APK with Google Analytics and Proguard activated I have this problem.</p>
  
  <p>I have added to my conf the this condition -></p>
  
  <pre><code>  -keep public class com.google.** {*;}
  </code></pre>
  
  <p>And this is console output</p>
  
  <pre><code>  Proguard returned with error code 1. See console
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.EasyTracker: can't find referenced class com.google.android.apps.analytics.Item
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.EasyTracker: can't find referenced class com.google.android.apps.analytics.Transaction
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.EasyTracker$4: can't find referenced class com.google.android.apps.analytics.Item
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.EasyTracker$4: can't find referenced class com.google.android.apps.analytics.Item
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.EasyTracker$5: can't find referenced class com.google.android.apps.analytics.Transaction
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.EasyTracker$5: can't find referenced class com.google.android.apps.analytics.Transaction
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegate: can't find referenced class com.google.android.apps.analytics.Transaction
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegate: can't find referenced class com.google.android.apps.analytics.Item
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegateImpl: can't find referenced class com.google.android.apps.analytics.GoogleAnalyticsTracker
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegateImpl: can't find referenced class com.google.android.apps.analytics.GoogleAnalyticsTracker
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegateImpl: can't find referenced class com.google.android.apps.analytics.GoogleAnalyticsTracker
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegateImpl: can't find referenced class com.google.android.apps.analytics.GoogleAnalyticsTracker
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegateImpl: can't find referenced class com.google.android.apps.analytics.GoogleAnalyticsTracker
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegateImpl: can't find referenced class com.google.android.apps.analytics.GoogleAnalyticsTracker
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegateImpl: can't find referenced class com.google.android.apps.analytics.GoogleAnalyticsTracker
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegateImpl: can't find referenced class com.google.android.apps.analytics.GoogleAnalyticsTracker
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegateImpl: can't find referenced class com.google.android.apps.analytics.GoogleAnalyticsTracker
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegateImpl: can't find referenced class com.google.android.apps.analytics.GoogleAnalyticsTracker
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegateImpl: can't find referenced class com.google.android.apps.analytics.GoogleAnalyticsTracker
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegateImpl: can't find referenced class com.google.android.apps.analytics.GoogleAnalyticsTracker
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegateImpl: can't find referenced class com.google.android.apps.analytics.GoogleAnalyticsTracker
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegateImpl: can't find referenced class com.google.android.apps.analytics.GoogleAnalyticsTracker
      [2013-10-26 19:25:17 - UploadToServer] Warning: com.google.android.apps.analytics.easytracking.GoogleAnalyticsTrackerDelegateImpl: can't find referenced class com.google.android.apps.analytics.GoogleAnalyticsTracker
  </code></pre>