Added reschedule:interval method to CCNode.

Added reschedule:interval method to CCNode.m. When you call the reschedule:interval: method using a selector that is already scheduled this method will update the interval.  It may be useful to use this method at certain times rather than using the  schedule:interval: method (which will unschedule and then reschedule an already scheduled method).

If you call reschedule:interval method and pass in a selector that was never scheduled, this method will schedule the selector for the first time.

Author: AT2014

cocos2d/CCNode.m

@@ -1230,6 +1230,32 @@ -(CCTimer *) schedule:(SEL)selector interval:(CCTime)interval
 	return [self schedule:selector interval:interval repeat:CCTimerRepeatForever delay:interval];
 }
 
+-(CCTimer*)reschedule:(SEL)selector interval:(CCTime)interval
+{
+    NSString *selectorName = NSStringFromSelector(selector);
+    
+    CCTimer *currentTimerForSelector = nil;
+    
+    for (CCTimer *timer in [_scheduler timersForTarget:self])
+    {
+        if([selectorName isEqual:timer.userData])
+        {
+            CCLOG(@"%@ was already scheduled on %@. Updating interval from %f to %f",NSStringFromSelector(selector),self,timer.repeatInterval,interval);
+            timer.repeatInterval = interval;
+            currentTimerForSelector = timer;
+            break;
+        }
+    }
+    
+    if (currentTimerForSelector == nil)
+    {
+        CCLOG(@"%@ was never scheduled. Scheduling for the first time.",selectorName);
+        currentTimerForSelector = [self schedule:selector interval:interval];
+    }
+
+    return currentTimerForSelector;
+}
+
 -(BOOL)unschedule_private:(SEL)selector
 {
 	NSString *selectorName = NSStringFromSelector(selector);