added aria role and data attributes to previous/next buttons
change the name of the data-* attributes on the play/pause and prev/next buttons
added helper function for detecting enter keypress
switched to helper method for detecting enter key and added enter key detection for previous/next buttons
added keyboard navigation and screen reader text for pagination buttons
corrected aria-role attribute to role
changed slide title to div as there is no inherent reason to make it a heading
changed slide title to div as there is no inherent reason to make it a heading
moved navigational buttons after slides so the slide content gets read first by screen readers
added classes for slide title and description