removeEventListener
Listen to when a compute changes value.
    compute.removeEventListener(eventType, handler)
  
  var age = compute(33);
age.removeEventListener('change', function(ev, newVal, oldVal){
    ev //-> {type: "change", batchNum: 5}
    newVal //-> 34
    oldVal //-> 33
});
age(34);
  
  Parameters
- eventType 
{String}:The name of the event to bind on, usually
change. - handler 
{function(event, args...)}:The handler to be called when this type of event fires.