unified gzip handling in outputbuffer

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3852 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
sites: redirect bugfix

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3853 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (2949) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3854 1f8fe7d8-47f0-464c-8d0a-336f4953ab05