def history
      options = { :query => { :email => @email_address } }
      response = cs_get "/subscribers/#{@list_id}/history.json", options
      response.map{|item| Hashie::Mash.new(item)}
    end
def history
      options = { :query => { :email => @email_address } }
      response = cs_get "/subscribers/#{@list_id}/history.json", options
      response.map{|item| Hashie::Mash.new(item)}
    end
Gets the historical record of this subscriber's trackable actions.