def update(title, unsubscribe_page, confirmed_opt_in,
      confirmation_success_page, unsubscribe_setting="AllClientLists",
      add_unsubscribes_to_supp_list=false, scrub_active_with_supp_list=false)
      options = { :body => {
        :Title => title,
        :UnsubscribePage => unsubscribe_page,
        :ConfirmedOptIn => confirmed_opt_in,
        :ConfirmationSuccessPage => confirmation_success_page,
        :UnsubscribeSetting => unsubscribe_setting,
        :AddUnsubscribesToSuppList => add_unsubscribes_to_supp_list,
        :ScrubActiveWithSuppList => scrub_active_with_supp_list }.to_json }
      cs_put "/lists/#{list_id}.json", options
    end
def update(title, unsubscribe_page, confirmed_opt_in,
      confirmation_success_page, unsubscribe_setting="AllClientLists",
      add_unsubscribes_to_supp_list=false, scrub_active_with_supp_list=false)
      options = { :body => {
        :Title => title,
        :UnsubscribePage => unsubscribe_page,
        :ConfirmedOptIn => confirmed_opt_in,
        :ConfirmationSuccessPage => confirmation_success_page,
        :UnsubscribeSetting => unsubscribe_setting,
        :AddUnsubscribesToSuppList => add_unsubscribes_to_supp_list,
        :ScrubActiveWithSuppList => scrub_active_with_supp_list }.to_json }
      cs_put "/lists/#{list_id}.json", options
    end
Updates this list.
 title - String representing the list title/name
 unsubscribe_page - String representing the url of the unsubscribe
   confirmation page
 confirmed_opt_in - A Boolean representing whether this should be a
   confirmed opt-in (double opt-in) list
 confirmation_success_page - String representing the url of the
   confirmation success page
 unsubscribe_setting - A String which must be either "AllClientLists" or
   "OnlyThisList". See the documentation for details:
   http://www.campaignmonitor.com/api/lists/#updating_a_list
 add_unsubscribes_to_supp_list - When unsubscribe_setting is
   "AllClientLists", a Boolean which represents whether unsubscribes from
   this list should be added to the suppression list
 scrub_active_with_supp_list - When unsubscribe_setting is
   "AllClientLists", a Boolean which represents whether active sunscribers
   should be scrubbed against the suppression list