The path problems are actually quite complex -- I think the best solution would be to have `make client-test` ensure some sort of reverse-proxy is running for the browser tests.  I messed around with using a SimpleHTTPServer on another port, but that can't do the reverse-proxying automatically.  So I think we should bunt on this for now, although I did create a `Makefile` so that this is no more than running `make test-client`.