Puts ActiveRecord::SessionStore attributes in white list, fixes #483 #484
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When using global whitelisting, AR::SS does not work at all (depending of your RDBMS you may get an ActiveRecord::StatementInvalid exception because of NULL constraint on session_id).
This problem exists in Rails 2, Rails 3 and Rails 3.1.
But as Rails 3.1 got a new feature to easily enable global whitelisting (config.active_record.whitelist_attributes = true), I think we should fix AR::SS to work by default when using this feature.