Set inactive swiper slides' CSS property 'visibility' hidden during drawer menu animation.
Animate swiper resize and positioning when toggling drawer menu:
 * register swiper wrapper element to featureContainerDirective
 * renamed snapDrawerDragDirective to registerElementToFeatureDirective, added unregister callback to scope destroy event and support for swiper wrapper element
 * getSwiperSlides helper function in SwiperService
 * replaced JavaScript DOM querying functions with AngularJS directives and Swiper.js in featureContainerDirective