Adjust setup_practicing_git script to auto-add people to the owners of the github orgs

[paulproteus]

Right now, I have to add all the mentors to the github orgs.

https://developer.github.com/v3/orgs/teams/ should let us automate that, I believe.

[sri-teja]

I want to do some work here. Can anyone explain me about this clearly? If I can do this, then I will try to fix this.

[shaunagm]

@paulproteus - would you be up for mentoring/pairing with @sri-teja on this?

[paulproteus]

+1

I'll try to write up a detailed description of what I would do to fix this within 24 hours and leave that here, as a start!

@sri-teja -- let me know once you've read that, and I'm also happy to schedule time to discuss this on IRC or Google Hangouts or similar. If you'd like, we could remote-pair-program, if network bandwidth and time zones work out for it.