Can't be installed on PHP 7.0.X

[robinlahtinen]

After installation is done:

RuntimeException: PHP Warning: Declaration of Newscoop\Form\Element\OldHash::render(Newscoop\Form\Element\Zend_View_Interface $view = NULL) should be compatible with Zend_Form_Element::render(Zend_View_Interface $view = NULL) in /var/www/Newscoop/library/Newscoop/Form/Element/OldHash.php on line 18 PHP Fatal error: Cannot use string as string because 'string' is a special class name in /var/www/Newscoop/library/Newscoop/Controller/Action/Helper/Datatable/Adapter/AAdapter.php on line 5 in /var/www/Newscoop/library/Newscoop/Installer/Services/FinishService.php line 55 at FinishService->generateProxies() in /var/www/Newscoop/install/index.php line 344 at {closure} (object(Request)) at call_user_func_array(object(Closure), array(object(Request))) in /var/www/Newscoop/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php line 145 at HttpKernel->handleRaw(object(Request), '1') in /var/www/Newscoop/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php line 66 at HttpKernel->handle(object(Request), '1', true) in /var/www/Newscoop/vendor/silex/silex/src/Silex/Application.php line 547 at Application->handle(object(Request)) in /var/www/Newscoop/vendor/silex/silex/src/Silex/Application.php line 524 at Application->run() in /var/www/Newscoop/install/index.php line 354