Faster tests

This brings the tests from 27 seconds to 4 seconds on my machine, which makes it much more pleasant to run the test suite.  About half of it was getting rid of the super slow large bignum Hamming number test, and the other half was in the other three.  The most important cleanup was to the web server / HTTP test, which was actually pointing out at the real internet, which is definitely a no no if we want consistent tests.  I changed it to link up to the web server defined here already, and was able to get rid of the delay.