Base implementation

- [ ] Registration (with csrf)
- [ ] Authentication (with csrf)
- [ ] Optional account activation (Using `Roave\NonceUtility && Roave\EmailTemplates` )
`$form->prepare();` is already triggered here: [View\Helper\Form#60](https://github.com/zendframework/zf2/blob/master/library/Zend/Form/View/Helper/Form.php#L60)