Disable registration via config

This currently only affects the link in the login form
Merge branch 'develop' of git://github.com/braincrafted/user-bundle into develop

* 'develop' of git://github.com/braincrafted/user-bundle:
  Tests for RequestInviteFormHandler
  Tests for RegistrationFormType and RequestInviteFormType
  PHPDoc
  Added tests for InviteFormType
  Added test for InviteToCodeTransformer
  Tests for InviteRequestManager
  Tests for User and Invite
  Removed phpunit.xml
  Check style
  Added tests
  Find invite requests
  User can request an invite
  Added invites

Conflicts:
	DependencyInjection/BcUserExtension.php
	DependencyInjection/Configuration.php