make CCRect accept width<0 and height<0

cocos2dx/cocoa/CCGeometry.cpp

@@ -119,8 +119,8 @@ CCRect& CCRect::operator= (const CCRect& other)
 
 void CCRect::setRect(float x, float y, float width, float height)
 {
-    // Only support that, the width and height > 0
-    CCAssert(width >= 0.0f && height >= 0.0f, "width and height of Rect must not less than 0.");
+    // CGRect can support width<0 or height<0
+    // CCAssert(width >= 0.0f && height >= 0.0f, "width and height of Rect must not less than 0.");
 
     origin.x = x;
     origin.y = y;