title: cocos2d-x, share or reuse CCTexture2D
body: <p>In my game, every single character have same textures. 
  So if there are 100 characters in a scene, 
  there should be 100 sprites with textures, 
  and there could be a memory problem.</p>
  
  <p><br/>
  So I think if it's possible to share one single CCTexture2D,(I mean one memory allocation)
  the memory usage will be drop dramatically.</p>
  
  <p>is it possible with static or global declaration?</p>
  
  <p>Any comments plz~ </p>