setup.py implementation.
Partial implementation.

Basic decomposition.
_log(), _interrupt_raiser(), _HubProxy implementation.
_Hub, _ping_it(), _HubProxy.context() implementation.
_worker() implementation.
_Callback implementation.
_Callback and _add_task() refactoring.
_auto_restart() + correct thread quiting implementation.
_auto_restart(): verbosity level was increased.
_worker() bug fix.
_Callback.send(), _ProcessSetting, _worker() bug fixes.
_ping_it() bug fix.
_ping_it() bug fix.
New modules: dcs, callback.
New class: Worker.
Worker.serve_forever(): signals argument implementation.
__main__ code was moved into cli module.
Worker and cli bug fixes.
Worker._add_task() race condition fix.
xmlrpc.client.ServerProxy timeout implementation.