Fix #4571: Show banner when email verification is required.

* Show a banner if the user is restricted because they signed up from a
  proxy or VPN.

* Add an option to resend the confirmation email if your account has an
  unverified email address.

app/policies/email_address_policy.rb

@@ -9,6 +9,15 @@ class EmailAddressPolicy < ApplicationPolicy
   end
 
   def verify?
-    record.valid_key?(request.params[:email_verification_key])
+    if request.params[:email_verification_key].present?
+      record.valid_key?(request.params[:email_verification_key])
+    else
+      record.user_id == user.id
+    end
+  end
+
+  def send_confirmation?
+    # XXX record is a user, not the email address.
+    record.id == user.id
   end
 end