Added graceful handling for both statsd and python-statsd pip packages.

I recently published a pip for our operations use that leveraged the statsd pip package, but I was unable to run it on any machine with Diamond installed!

I know this is a PIP namespacing problem, but here is a quick fix that worked for me.

All my production graphs look the same, no deviation after switching over to this code.

It may be prudent for some others to verify/test as well just in case as I know lots of production systems are running off this code.