http/2 test framework

I know we talked about this at the last interim meeting, but as far as I
know, nothing has happened on this front. Has anyone started on this yet?
I'd love to see us make progress on this front. I also think that this will
help clarify corners of the spec, since everytime we raise an ambiguity, we
really oughta write a test for it.

Here are my rough thoughts here:
* Again, host all code/configuration on github, probably in the http2
organization again
* Run a http2 test server in EC2. Host client test on it
* Have code for a server test. Uses a test client and a set of test pages.
Servers must host the pages at well defined paths.
* Um, think something up for proxies. Not hard, but I'm running outta time
here.

Mostly, I want to get people thinking about this and wanted to see who's
interested in working on this. I actually don't want to work on it since as
many people know, I'm technically part-time (20%) employed now
hacking/traveling. But if no one steps up to contribute here, I will
probably do so. That would be terrible because I'm busy traveling most of
the time, and if people left it up to me, I would write everything in Go
just to learn it. I know Mark has some basic SPDY code in Python that would
be a good foundation for this work.

So yeah, let's get started on this testing thing. I think it's important.