* com_jshopping (only product page)
This plugin is expandable, so you can prepare the last modified date for the requested object in the /plugins/com_yourcomponent.plugin.php.
+ an option was added to activate plugin only for search-engines bots to avoid page caching by browsers ( to check results manually you should turn off this option! )
^ removed option to check for if-modified-since request because of incorrect work
^ some logical operation
+ ZOO: frontpage & category pages processing
+ new plugin option: check for if-modified-since request in HTTP or not to avoid unnecessary plugin's work