[Speed] Setting up Codespeed on speed.python.org

[Zachary Ware]

Hi all,

Thanks to funding from Intel, I've recently been working on getting
Codespeed set up on speed.python.org, and finally have everything
(mostly) working in a dev environment.  At this point I would greatly
appreciate having extra eyes on my work to make sure I haven't missed
anything obvious, and to smooth out some of the rougher edges.

The part in most need of review is the changes to the PSF Salt
configuration to set up and run Codespeed on speed.python.org.  The
changes can be found in PR #74 on the psf-salt Github repo[0].

The Codespeed instance is housed in a Github repo owned by me[1].
There's one small patch to the codespeed code, the rest of the changes
in my fork are adapting a copy of the sample_project to be our own
instance.

The final piece that could use review is the changes to our benchmark
repository, currently available in a sandbox repo on hg.python.org[2].

Please have a look, give it a try if you can, and let me know what
needs improvement!

Regards,
-- 
Zach

[0] https://github.com/python/psf-salt/pull/74
[1] https://github.com/zware/codespeed
[2] https://hg.python.org/sandbox/zware-benchmarks