PIMCORE-1828 - Enable d&d ordering for objects with metadata

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2148 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
added method to generate screenshots of pages

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2149 1f8fe7d8-47f0-464c-8d0a-336f4953ab05