[Web-SIG] [PEP 444] Future- and Generator-Based Async Idea

[Alice Bevan–McGregor]

Here's what I've mutated Alex Grönholm's minimal middleware example 
into: (see the change history for the evolution of this)

	https://gist.github.com/771398

A complete functional (as in function, not working ;) async-capable 
middleware layer (that does nothing) is 12 lines.  That, I think is a 
reasonable amount of boilerplate.  Also, no decorators needed.  It's 
quite readable, even the way I've compressed it.

The class-based version is basically identical, but with added comments 
explaining the assumptions this example makes and demonstrating where 
the acutal middleware code can be implemented for simple middleware.

	- Alice.