SSENSE / vue-carousel / 612

68%

master: 74%

Pull #349

travis-ci

feat(accessibility): use correct aria properties

Based on [aXe](https://www.deque.com/axe/) recommendations, fix accessibility:
 - Use proper roles for the various components (ex: role="button" not needed on buttons).
 - Reorder navigation and pagination to better match the tabbing order.
 - Make navigation accessible by tabbing.
 - Change the HTML elements to better match [W3's recommended organization](https://www.w3.org/TR/wai-aria-practices/examples/tabs/tabs-1/tabs.html)

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