We will log the errors, however no point in failing; not only can this
hide errors that occured setting up the firewall, but is pointless as we
can't actually handle these errors in a good way anyway.

Fix bug reported by @matiwinnetou in #31

None >= 1 not valid under Python3.

Fixes #31.

Add tests_require into setup.py

pytest and mock are needed for running tests.

This needs to be redone; will do so at a later stage.

Closes #28.

As Handler objects can have multiple sockets, we need to know which one
was involved in the incoming event.

Don't pass auto back.

Broken and not been maintained in some time. See #21.

Fix bug in tproxy recv_udp() method.

importlib is Python 2.7 only.