json encode / json helper cycle (recursion) detection: json_encode() isn't capable of anymore (PHP 5.5)

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3274 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (2804) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3275 1f8fe7d8-47f0-464c-8d0a-336f4953ab05