Fix bug - don't update the delegate if the handles are not selected. …

…Note if you relied on behaivour of the delegates being notified even when updated by code, this was unintentional and will no longer happen and will be a breaking change for you. The Delegates will only be updated as a result of user interaction

Pod/Classes/TTRangeSlider.m

@@ -294,7 +294,7 @@ - (void)refresh {
     [self updateLabelValues];
 
     //update the delegate
-    if (self.delegate){
+    if (self.delegate && (self.leftHandleSelected || self.rightHandleSelected)){
         [self.delegate rangeSlider:self didChangeSelectedMinimumValue:self.selectedMinimum andMaximumValue:self.selectedMaximum];
     }
 }