New ebay item specifics code added

Add jquery.ebay-specifics-form.js plugin (loads from app-admin-init.js)
Updated syndication.js to use the plugin, massive changes there and I really want
to clean up some pieces (unused handlers/xslt files still left there)
Merge branch 'ebay_specifics_fix' into 201332
Merged ebay item specifics code

Added extensions/admin/resources/jquery.ebay-specifics-form.js, css, png