Minor fixes

Changelog

• Minor demo fixes 41a024b
• fixing #227, V3/V4 Carousel cannot use slideTo to jump to the current active item
• documentation updates regarding #227
• Carousel ignoring data-interval #241c6e261e
• Fix isNaN ReferenceError in V3 #243
• Fix infinite loop if user calls carousel.cycle() 27cfd8f
• Dropdown aria-expanded #245