Removing MooTools dependencies form media/com_finder/js/indexer.js and removing unused JS

Under GSoC MooTools to jQuery project, this PR removes the MooTools dependencies in media/com_finder/js/indexer.js file and removing hilighter.js and finder.js which is not used within the CMS.

Feature Request Item:
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=32042&start=575