The Review/Reply Draft resources redirect to a resource with the

appropriate ID, but when doing so, they don't preserve any query string

arguments. This means that if something like ?api_format or

?force-text-type is used, it will be lost.
We now have a useful utility function for building a URL that preserves

all query string arguments that aren't automatically preserved by the

base WebAPIResource. These are used in all two resources that do a

redirect from a GET.

Tested manually, and with an in-progress change that relies on this behavior.
unit tests pass.