Move CronoJob to models dir

lib/crono.rb

@@ -15,5 +15,4 @@ require 'crono/scheduler'
 require 'crono/config'
 require 'crono/performer_proxy'
 require 'crono/cronotab'
-require 'crono/orm/active_record/crono_job'
 require 'crono/railtie' if defined?(Rails)

lib/crono/orm/active_record/crono_job.rb

@@ -1,13 +0,0 @@
-require 'active_record'
-
-module Crono
-  # Crono::CronoJob is a ActiveRecord model to store job state
-  class CronoJob < ActiveRecord::Base
-    self.table_name = 'crono_jobs'
-    validates :job_id, presence: true, uniqueness: true
-
-    def self.outdated
-      self
-    end
-  end
-end