Building out server support

[lovelydinosaur]

There's a couple of aspects of the server support that need a little maturing...

• Documentation. (Example cases... hello, world, simple API echoing, file server)
• Connection reuse. Obvious & easy, just not implemented in the first-pass.
• Connection timeouts.
• Seperation of low-level networking from HTTP handling, similarly to client case.
• HTTPS support.
• Multi-socket serving. (Review against trio's listeners API)
• Review how we handle logging, perhaps?
• Documenting process managers (gunicorn, circus, supervisor).
• Documenting reloaders (watchdog using watchmedo auto-reload).