Add "sort=" param to API and support API sorting
Add "sort=" param to API and support API sorting

This feature extends the API with a "sort=" parameter that can take a
list of mongo field names to sort using the mongoengine order_by(...)
call. This supports ascending sort (sort=field), descending sort
(sort=-field) and even multi-field sorting
(sort=field1,field2,-field3,...).

Magicked/crits,Magicked/crits,Magicked/crits,Magicked/crits