This hook will re-expose the deprecated, but accidentally removed, Plugin Installer.
Please note, that the Official and Community Repository is no longer being updated by Liferay as the plugins have been moved to our new Marketplace. If you are running Liferay 6.1 GA2 or above. Please find the new plugins at http://www.liferay.com/marketplace
By deploying the new hook, you'll have access to the Plugin Installer via the Control Panel item "Plugins Installation" as a new tab "Private Plugin Installer"