* TimeEntry#cost will return the amount the TimeEntry costs based on:
** logged hours times the assigned rate amount
** logged hours times the effective project rate for the user
** logged hours times the effective default rate for the user
** 0 if the user has no rates at all
#1924
* 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
* Wrapped UsersHelper#user_settings_tabs with an alias_method_chain
* Added the new Rate element to the return of user_settings_tabs
* Added RSpecs to confirm the change works without breaking
* Added a partial view for users/rates which will be used by Redmine
when it renders the user edit panel
#1913
