macro fun

+ add a macro for creating a user, then deleting him when you're done
+ just don't write any macro bodies that require access to the response from the post-new-user-request or the delete-user-request! (like the user's id)
+ I have a feeling that I'll probably remove that macro at a later time, in favor of just creating a user, then deleting him, scoped to only a (deftest) form