Setup your crontab like this. Paths may differ but you'll get the idea.
*/1 * * * * php -c /etc/php5/cli/php.ini /var/www/domain.com/bin/magento cron:run >/dev/null
*/1 * * * * php -c /etc/php5/cli/php.ini /var/www/domain.com/update/cron.php >/dev/null
*/1 * * * * php -c /etc/php5/cli/php.ini /var/www/domain.com/bin/magento setup:cron:run >/dev/null
>/dev/null being silent mode
You'll also want to make sure those directories/.files are there before trying to update 2.0.0. Any of those missing (they normally are missing in 2.0.0) the upgrade will fail.
domain.com/vendor/magento/magento2-base/dev/tests/integration/.gitignore
domain.com/vendor/magento/magento2-base/dev/tests/integration/.gitignore
domain.com/vendor/magento/magento2-base/dev/tests/functional/.gitignore
domain.com/vendor/magento/magento2-base/dev/tests/js/JsTestDriver/.gitignore
domain.com/vendor/magento/magento2-base/dev/tests/api-functional/.gitignore
domain.com/vendor/magento/magento2-base/dev/tests/unit/.gitignore
domain.com/vendor/magento/magento2-base/dev/tests/static/.gitignore
domain.com/vendor/magento/magento2-base/dev/tests/js/JsTestDriver/.gitignore
domain.com/vendor/magento/magento2-base/dev/tests/api-functional/.gitignore
domain.com/vendor/magento/magento2-base/dev/tests/unit/.gitignore
domain.com/vendor/magento/magento2-base/dev/tests/static/.gitignore
domain.com/vendor/magento/magento2-base/dev/tests/integration/.gitignore
domain.com/vendor/magento/magento2-base/dev/tests/functional/.gitignore