v2.8.6

• Fixed: autoHeight on resize.
• Fixed: customized elements still visiable when slides less than items. #259
• Fixed: fix a container height issue in slider initialization in gallery mode by setting active sliders as relative positioned. #260
• Fixed: startAutoplay() excute 2 times when set autoHeight: true. #258
• Fixed: destroy(). #255
• Fixed: reverse slide selector from tag to class in tiny-slider.scss. #256
• Improved: show/hide element functions.
• Improved: set more methods and properties to null in destroy().