Added reschedule method to CCNode header

Added reschedule:interval: method to CCNode header file.

Author: AT2014

cocos2d/CCNode.h

@@ -552,6 +552,17 @@ A common user pattern in building a Cocos2d game is to subclass CCNode, add it t
  *
  *  @return A newly initialized CCTimer object.
  */
+ 
+ /**
+ * Schedules a custom selector with an interval time in seconds.
+ * If the custom selector you pass in is not already scheduled, this method simply schedules it for the first time.
+ * The difference between this method and the schedule:interval: method is that if the selector passed in this method is already scheduled, calling this method will only adjust the interval on the already scheduled method. In contrast, when you call schedule:interval: on an already scheduled selector, your custom selector will be unscheduled and then rescheduled.
+*  @param s       Selector to execute.
+*  @param seconds Interval between execution in seconds.
+ */
+-(CCTimer*)reschedule:(SEL)selector interval:(CCTime)interval;
+ 
+ 
 - (CCTimer *) scheduleOnce:(SEL) selector delay:(CCTime) delay;
 
 /**