* Added SortHelper to RatesController * Init and updating the sorting (pre 0.8 sort_update) * RatesController#index will only render the layout on non-xhr requests * Changed Rate.history_for_user to take an order clause * Added rate_sort_header_tag and rate_sort_link to the SortHelper in order to get the correct parameters for sorting Rates * Added rate_sort_header_tags to the Rate lists #1915