title: Android GameHelper without BaseGameActivity
body: <p>I want to implement google leaderboards in my game. Google says that i need to use BaseGameActivity but I am using AndEngine and its not based on the same BaseGameActivity.</p>
  
  <p>At googles website its written that if i do not use BaseGameActivity i should use GameHelper.</p>
  
  <pre><code>mHelper = new GameHelper(this, GameHelper.CLIENT_ALL);
  </code></pre>
  
  <p>But GameHelper class is not resolved. Do you know which library i should implement and how should i implement to get the GameHelper class working </p>