Improve ASV Environment Creation Performance
...by leveraging a lot of the recent work to enable parallel CI

Overriding default values documented here:

https://asv.readthedocs.io/en/stable/asv.conf.json.html#build-command-install-command-uninstall-command

I've picked 4 as the value assuming most people running benchmarks will have 2-4 cores. YMMV 
LGTM.  any ballpark on the perf imrpovement? It varies depending on hardware, with physical cores I think being the big thing. My quad core desktop can build clean in about 20 seconds. Duo core laptop Takes 2-3 minutes. Non parallel I think around 8-10 minutes

Whatever the savings are multiply by two for the ASV environment creation

Sent from my iPhone

> On Jan 1, 2020, at 9:27 PM, jbrockmendel <notifications@github.com> wrote:
> 
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> LGTM. any ballpark on the perf imrpovement?
> 
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 Thanks! Will report how it does on the benchmark machine.