stop() {
			if (!this.active())
				return false;

			document.dispatchEvent(new CustomEvent('poll-stop'));
			window.clearInterval(this.timer);
			delete this.timer;
			delete this.tick;
			return true;
		}
Stop the polling loop. Dispatches a custom `poll-stop` event
to the `document` object upon successful stop.

@instance
@memberof LuCI.poll
@returns {boolean}
Returns `true` if polling has been stopped or `false` if it didn't
run to begin with.