function unlistenArrayEvents(array, listener) {
		var stub = array._chartjs;
		if (!stub) {
			return;
		}

		var listeners = stub.listeners;
		var index = listeners.indexOf(listener);
		if (index !== -1) {
			listeners.splice(index, 1);
		}

		if (listeners.length > 0) {
			return;
		}

		arrayEvents.forEach(function(key) {
			delete array[key];
		});

		delete array._chartjs;
	}
Removes the given array event listener and cleanup extra attached properties (such as
the _chartjs stub and overridden methods) if array doesn't have any more listeners.