Task:Caption convert caption js, mootools dependent js file to jquery with caption-jquery-uncompressed.js

This PR includes the jquery version of the caption js file which adds captions for images.

Feature Tracker Item:
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=31576&start=500

@tested on frontend article editing and adding captions.