Changed popover trigger event to hover
Changed popover trigger event to hover

- app/assets/javascripts/popover.js - Added a trigger hover event
  to the popover so that the popover disappears when the mouse leaves
  the element

Updates #721

EBWiki/EBWiki,EBWiki/EBWiki,BOWiki/BOW,EBWiki/EBWiki,EBWiki/EBWiki,BOWiki/BOW,BOWiki/BOW