[carousel] ARIA tweaks #420
Merged
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Optimised control and indicator native tab order (by moving indicators below controls)
Switched to native tabbing for indicators (rather than keyboard nav for indicators)
Removed unnecessary data-slide attributes on prev/next controls
Pauses animation while page is not visible (using document.hidden where supported, http://caniuse.com/#feat=pagevisibility)
Bonus: Reduction in code size