Remove 'id-email-verification' switch

This has been working fine in production for a month or so, we don't want
to unlaunch this feature.

https://profile.theguardian.com/account/edit
Remove discussion-verified-email-posting switch

On behalf of @james-rodgers on the Discussion team...
Extend Ethical Awards voting forms feature switch until mid-May

http://www.theguardian.com/observer-ethical-awards/key-awards-dates-2014
Merge pull request #3688 from guardian/remove-identity-switches

Remove identity switches