* addItemDirective:
 * register add item element to scroller to scroll to focused element
 * toggle swiper-no-swiping and data-snap-ignore in focused/blurred add item element
 * replaced add<Item> method with callAndRefresh method
 * removed mouse swipe support from swiper by setting simulateTouch swiper parameter to false
 * removed mouse swipe support from IScroll by setting disablemouse option to true
 * scrollToDirective supports multiple add item element

* decreased scroller swipe to next/previous slide threshold from 70px to 60px
* prevent swiper and snap.js drawer in accordion with swiper-no-swiping class and data-snap-ignore attribute