Here are my steps to make it work with the GAE SDK.
(Probably not the best ones)
Assuming that go-json-rest is installed using "go get"
and that the GAE SDK is also installed.
Setup:
* copy this examples/gae/ dir outside of the go-json-rest/ tree
* cd gae/
* mkdir -p github.com/ant0ine
* cp -r $GOPATH/src/github.com/ant0ine/go-json-rest github.com/ant0ine/go-json-rest
* rm -rf github.com/ant0ine/go-json-rest/examples/
* path/to/google_appengine/dev_appserver.py .