Destroy method now properly removes the eventListeners

[andy-UKC]

The valueChange() function was bound (to this) before both adding and removing the eventListener. In both cases this would create a new reference to the function.

Now the resulting function of the bind is passed to the eventListener, and can be used to remove it in destroy()

[brianvoe]

Im sure there was a reason I did this but ill give your branch a shot and see if it still works