If was removed from the version [0.1.0-alpha107] (https://github.com/magento/magento2/blob/d50ee54/CHANGELOG.md#010-alpha107) (Dec 5, 2014).
The latest version of the Magento_RecurringPayment module in Magento 2 is 0.1.0-alpha106:
github.com/magento/magento2/tree/0.1.0-alpha106/app/code/Magento/RecurringPayment