Binding callbacks to object breaks ActiveRecord integration

[SkyWriter]

Happens something like this:

StateMachine::Callback.bind_to_object = true

class Vehicle < ActiveRecord::Base
  state_machine :initial => :parked do
    event :ignite do
      transition :parked => :idling
    end
  end
end

Vehicle.new.ignite!

# NoMethodError:
#       undefined method `notify' for #<Vehicle:0x007fc447433768>

Looks like callbacks are mistakenly being called on Vehicle object rather than StateMachine::Machine.

[tyre]

:+1: