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.

Is Python 2.x only. Not supported under Python 3.x.

Pull out firewall methods code into seperate files.

Fix problems starting with method=='auto'; we were making decisions
based on the method, before the method had been finalized by the
firewall.

Only very basic testing so far. What could go wrong?

Was broken by passing environment variable PYTHONPATH to process. Will
fix this if there is a use case for it.

* Make compatible with setuptools.
* Load modules via ssh into separate modules, not the one name space.

Import resolvconf_nameservers, fix wrong types

Add resolvconf_nameservers to the list of functions imported from
helpers.
Fixed an instance where the method client.main was being called with
ns_hosts (string obtained from optional argument --ns-hosts) instead of
nslist (list of tuples that was already being passed to other methods).
Should fix issue #24.

dns: Added --ns-hosts to tunnel only some requests

By default, the --dns flag configures the firewall to only intercept
queries made to the nameservers defined in resolvconf. This flag enables
the user to explicitly specify the nameservers which queries will be
redirected. This can be useful when the local nameserver forwards
queries to some domains to a nameserver on the remote site of the
tunnel.

Remove no-latency-control assertion