title: CCRotateTo and CCRotateBy differnce
body: <pre><code>//CCRotateBy
  id action=[CCRotateBy actionWithDuration:1.0 angle:45];
  [player runAction:action];
  
  //CCRotateTo
  id action=[CCRotateTo actionWithDuration:1.0 angle:45];
  [player runAction:action];
  </code></pre>
  
  <p>the above two code produce same results...I need to know the difference between using rotateTo and rotateBy...
  please advise...</p>