thumbnail confix bugfix: high-res value 0 wasn't saved

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3708 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
demo: cleanup

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3709 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (2905) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3710 1f8fe7d8-47f0-464c-8d0a-336f4953ab05