Added functionality which allows to set how many slides will slide on…

[Ricco1]

… one click (usefull for multiple item carousels). For it to work it is required to add additional attribute: rn-carousel-items-per-slide=slide_amount_per_click (better to use together with rn-carousel-controls). For reference please see the demo. If attribute is empty or attribute value exceeds amount of available total slide amount, or attribute is not added - carousel works with default settings - one slide per click.