title: setTextureRegion AnimatedSprite
body: <p>I'm developping a game which implements gif sprites...
  After start with gif I used png image and for change the TextureRegion of my sprite I followed this guide: <a href="https://stackoverflow.com/questions/11667668/sprite-setimage-in-andengine">Sprite.setImage() in andengine</a> and it worked very well.</p>
  
  <p>Now I want to do the same thing with AnimatedSprite. Can someone tell me How i can edit the org.anddev.andengine.entity.sprite.AnimatedSprite.java to create: </p>
  
  <p><code>sprite.setAnimatedTextureRegion(PixelPerfectTiledTextureRegion textureRegion)</code></p>
  
  <p>P.S I use also <a href="https://github.com/MakersF/AndEngineCollisionsExtension" rel="nofollow noreferrer">PixelPerfect</a></p>