* Changed the form_for to be a remote_form_for
* Changed the url to use the js format
* Added RJS to add the Saved rate to the rate cell
* Added id to the table cell so the rate cell can be replaced on success
* Added an Error RJS to flash an error message
#1921
* Locked rates will fail to save
* Attempting to save a Locked rates will display an error and reload the
Rate from the database so the update parameters are thrown away
#1919
* Including projects in Rate.history_for_user
* Moved the valid sort options to a constant on the RatesController
* Changed the ValidSortOptions to use the Project name for project_id
* Updated admin view to use RatesController::ValidSortOptions instead of a
duplicated string.
#1915
* 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