[WIP]Allow newer version of zendframework

Per my comment in https://github.com/phpDocumentor/phpDocumentor2/issues/1385 this change should maintain BC with PHP 5.3.3
If this PR passes all tests on travis with 5.3.3 then it should be ok. I am not certain of that as I don't have access to a 5.3.3. installation of php.