pull request bot

[shanejonas]

if you've forked from or are a pristined project we can track it and make a pull request back when pristine base repository changes.

we can poll for either certain commits, or all commits from etclabscore/pristine in an orgs repos, and then if pristine changes, make a PR back with the changes.

[shanejonas]

heres a good start for a github app bot:

https://probot.github.io/docs/

[shanejonas]

ideally we can re-use some of this to get some generator-client auto PR's as well