Owners/admins of a repo should be able to give eeyore permission to triage

[carols10cents]

This should use github orgs/permissions, but whether it's "add the github user eeyorebot to a services team" or "oauth to the eeyore app and authorize the repo through the app" remains to be seen.

[carols10cents]

Basically we should look at how https://github.com/houndci/hound does it

[carols10cents]

Actually hound doesn't create a team anymore; they just use the collaborators API to add the hound user as a collaborator:

https://developer.github.com/v3/repos/collaborators/#add-user-as-a-collaborator

It looks like we could do that too-- to be able to edit issues, eeyore needs push access, and we can grant that using this API endpoint. This says the permission parameter is "Only valid on organization-owned repositories", which is what we need!

[carols10cents]

It looks like we need to request the public_repo scope during the oauth dance.