updated the modification system
also changed all references to .box to .panel
more modification work done
changed button name style from add-history to history-add
more work on updating the product info page done.
more product page work done.
altered the upload button code to purely use js
Merge branch 'master' of https://github.com/opencart/opencart into cache
Added APC and Memcache support, KEY_PREFIX to default cache