separate attrs for triggering set and index within that set
trigger paging
update pager text onPage
activate pager item visually when active
make next/prev buttons appear disabled when at either end of pager
validate toggle index, paginate when next/prev are clicked
show proper caption and hide others
refactor stylus
visually activate 'i' icon when caption is visible
move pager up when caption is visible
completely reset caption state onPage
cleanup
update demo style
cleaner demo styling