made Pimcore_Tool_Authentication::getSession() public again

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3361 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
changed user image to 46x46px

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3362 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (2828) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3363 1f8fe7d8-47f0-464c-8d0a-336f4953ab05