Removed registration form

> https://jira.ez.no/browse/EZP-22651
> Status: ready for review / open for translation

This completely removes the registration form at the end of the setup wizard, replacing  it with an introduction to the eZ Community.

![wizard](https://cloud.githubusercontent.com/assets/235928/2861207/0ebd7734-d1db-11e3-84c8-649d1131ffe9.PNG)