Performance/Unmount issue

[gabrielmicko]

When I navigate somewhere else and the slider gets unmounted the animate interval wont stop.

FIX:

componentWillUnmount() {
    window.removeEventListener('resize', this.setVisibleItems.bind(this, this.props.visibleItems));
    if (this.state.interval) {
      clearInterval(this.state.interval);
      this.setState({ interval: null });
    }  
  }