moveAfterLast() {
    const last = this.parent.childNodes[this.parent.childElementCount - 1];

    this.fire_(Events.LEAVE);
    this.parent.insertBefore(this.el, last.nextSibling);
    this.fire_(Events.ENTER);
  }
Moves the section to the bottom of the section's list.
@fires Slide#dom:leave
@fires Slide#dom:enter