StateMachine::InvalidTransition: Cannot transition state via :publish from :draft
	from /opt/local/lib/ruby/gems/1.8/gems/state_machine-0.7.2/lib/state_machine/event.rb:247:in `add_actions'
	from /opt/local/lib/ruby/gems/1.8/gems/state_machine-0.7.2/lib/state_machine/machine.rb:462:in `call'
	from /opt/local/lib/ruby/gems/1.8/gems/state_machine-0.7.2/lib/state_machine/machine.rb:462:in `publish!'
	from (irb):55