restrict object count by class name

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2776 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
PIMCORE-1951 - Select field, does't allow '0' as selected value, when the field is required

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2777 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
bugfix: object root folder -> search tab wasn't present

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@2778 1f8fe7d8-47f0-464c-8d0a-336f4953ab05