Merge pull request #69 from timglabisch/session_locking

Session locking #2

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3359 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (2827) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3360 1f8fe7d8-47f0-464c-8d0a-336f4953ab05