PIMCORE-1982 - creation of website previews (for document tree) not working when http_auth is set

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3032 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3033 1f8fe7d8-47f0-464c-8d0a-336f4953ab05