Moved Pimcore_Tool::createFolderByPath() to Element_Service - it can be called from extended classes e.g. Object_Service::createFolderByPath();

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2440 1f8fe7d8-47f0-464c-8d0a-336f4953ab05