RailsStateMachine 2.2.0 released

Added: State machine can now use the :prefix-option to avoid name collision if you define multiple state machines on the same model, and use state names more than once

Previously state_machine-definitions like this:

  class Form
  
    state_machine :first_wizard_stage do
      state :completed
    end

    state_machine :second_wizard_stage do
      state :completed
    end
    
  end

would produce the following warning:

  rails_state_machine-2.1.1/lib/rails_state_machine/state_machine.rb:62: warning: already initialized constant Form::STATE_COMPLETED

This can now be fixed with the :prefix-option:

  class Form
  
    state_machine :first_wizard_stage, prefix: :foo do
      state :completed
    end

    state_machine :second_wizard_stage, prefix: :bar do
      state :completed
    end
    
  end

This defines the following:
- constants: Form::STATE_FOO_COMPLETED and Form::STATE_BAR_COMPLETE
- instance methods: #foo_completed? and #bar_completed?

Fix bug where additional inclusions of RailsStateMachine::Model would reset previous defined state machines