t.w.distrib : module documentation

Distributed web servers.

This is going to have to be refactored so that argument parsing is done by each subprocess and not by the main web server (i.e. GET, POST etc.).

Class	Request	Undocumented
Class	Issue	Undocumented
Class	ResourceSubscription	No class docstring; 4/6 methods documented
Class	ResourcePublisher	Undocumented
Class	UserDirectory	Undocumented
Class	_ReferenceableProducerWrapper	Undocumented