remove dead set_admin code
test BasketController#find_changes
clean up param-ID handling

Now :id or :basket_id always refer to the basket ID. Order and SavedOrder
(friendly) IDs are only ever available as :order_id and :saved_order_id.
test TimeTracker
test for info message when destroying paid order
small test cleanups
update to more recent ruby
add note that changes to pinning need service restart