Python 3 problems

Hello Brian

I have two problems when using zmqweb with python3. I fixed one in the pull request.

The second can be triggered with this url: http://localhost:8888/foo/sleep?t=1

The parameter t will be binary ie b'1', json can't serialize this. I'm not sure how to fix this. I doubt that json is the right tool to encode this messages, since the http body can be binary anyways. My first idea was to replace json with pickle or bson, I suppose since you use zmq everyday you know a better solution.

Jean-Louis