Update to Symfony 2.6.
Display registration code and RAs on registration e-mail sent screen.
Correct email sent translation key.
Merge branch 'develop' into feature/display-code-list-ras

Conflicts:
	composer.lock
Revert to Middleware client bundle @ dev-develop.
Merge pull request #23 from SURFnet/feature/display-code-list-ras

Display registration code and list of RAs on registration e-mail sent page.
Merge branch 'develop' into feature/token-revocation

Conflicts:
	src/Surfnet/StepupSelfService/SelfServiceBundle/Service/SecondFactorService.php