title: Error when executing cc.RepeatForever() cocos2d-js
body: <p>when i execute:</p>
  
  <pre><code>var repeat_sprite = cc.Repeat.create(cc.Place.create(cc.p(10, 10)), 5);
  sprite.runAction(repeat_sprite);
  </code></pre>
  
  <p>it worked bout when i tried this one:</p>
  
  <pre><code>var repeat_sprite = cc.RepeatForever.create(cc.Place.create(cc.p(10, 10)));
  sprite.runAction(repeat_sprite);
  </code></pre>
  
  <p>it gives me this error in the console:</p>
  
  <pre><code>TypeError: locInnerAction.getElapsed is not a function
  </code></pre>
  
  <p>i don't know if the error is on my script or in the cocos source.</p>
  
  <p>PD.: i also tried:</p>
  
  <pre><code>cc.repeatForever(action);
  </code></pre>
  
  <p>it didn't work either.</p>
  
  <p>already thanks for the help.</p>