Adapt to the "new" ZeroRPC middleware API
Correctly pass the name of the method to _submit_response_time()
Don't try to submit the response time in the case of a NameError
Port the middleware to the new ZeroRPC (>= 0.4.0) middleware API
Merge pull request #1 from lopter/master

Port zerorpc-statsd to the zerorpc-python 0.4.0 middleware API