The goal for this episode is to implement client-side validation. For that we'll reuse code we've already written for server-side validation.

And as a bonus we'll refactor form code by extracting `TextFieldGroups` into separate reusable component.

Repository: https://github.com/Remchi/reddice
Blog post: http://remzolotykh.net/react-and-redux-08-user-sign-up-client-side-validation/