Switch to state_machines-activerecord (Fixes: #3374)

Gemfile

@@ -113,7 +113,7 @@ group :unicorn do
 end
 
 # State machine
-gem "state_machine", '~> 1.2.0'
+gem "state_machines-activerecord", '~> 0.3.0'
 # Run events after state machine commits
 gem 'after_commit_queue'
 

config/initializers/state_machine_patch.rb

 # This is a patch to address the issue in https://github.com/pluginaweek/state_machine/issues/251
 # where gem 'state_machine' was not working for Rails 4.1
-module StateMachine
+module StateMachines
   module Integrations
     module ActiveModel
       public :around_validation