Allow other javascript to act after validation

We'd like to hide the registration form if your emailadres is already in use. As far as we can see, friendly_register does not have any hooks after the JSON call is performed.

Calling Drupal.attachBehaviors() at the end of the getJSON()'s in Drupal.friendly_register.checkUserName() and Drupal.friendly_register.checkEmail() fixes this, but this also re-attaches the friendly_register exponentially ;)

This can be fixed by adding a once() in the focus() attachments: userName.field.once('friendly_register').focus(function () {

A patch is on it's way!