update also timestamp if child path changes

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2564 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
fixed plugin api

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2565 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
fixed plugin api

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2566 1f8fe7d8-47f0-464c-8d0a-336f4953ab05