Neopets.com recently added some new security rules that, if not
satisfied, cause the request to return 403 Forbidden.
We figured these out through trial and error, and added them to the
`DTIRequests` library, so they would apply to all requests we make.
We also updated our AMFPHP library to use `DTIRequests` as well, as an
easy way to get the same security rules to apply to those requests.
This change was motivated by pet loading being down for the past day or
so, because all pet loading requests were returning 403 Forbidden! Now,
we've fixed it, hooray!
Just getting this stuff out of Pet, in part because I want to start
being able to unit test modeling, and that will require stubbing out
what this service returns!
