added python setup for running tests against PROOF API

[sckott]

No WDL tests here yet, but there are some basic tests run against the dev api.

Questions:

• Should the python pieces/infrastructure be in the root of this repo or should I encapsulate them in a separate repo within root? i.e., will we use python to do testing for other stuff besides the API?
• File structure seem okay? any thoughts?
• We're not pulling WDL's from a wilds repo any more, correct? We're using WDL's from this repo, correct?

[seankross]

Subject to @tefirman signing off:

Should the python pieces/infrastructure be in the root of this repo or should I encapsulate them in a separate repo within root?

Keep it in the root.

File structure seem okay?

LGTM

We're not pulling WDL's from a wilds repo any more, correct?

Correct

We're using WDL's from this repo, correct?

Correct

[tefirman]

Agree with @seankross on all points. Looks good to me, thanks @sckott !