Add state machine patch to fix error with state machine

See here for details: pluginaweek/state_machine#251 (comment)

config/initializers/state_machine_patch.rb

@@ -0,0 +1,11 @@
+module StateMachine
+  module Integrations
+     module ActiveModel
+        public :around_validation
+     end
+
+     module ActiveRecord
+        public :around_save
+     end
+  end
+end