Use @token instead of @resource.{confirmation,reset_password,unlock}_token

Starting with devise-3.1 these variables no longer work thus the views
generate invalid links for confirmation, reset and unlock actions.

http://blog.plataformatec.com.br/2013/08/devise-3-1-now-with-more-secure-defaults/

Signed-off-by: Ali Polatel <ali.polatel@ozguryazilim.com.tr>