Integrate Contributor Covenant or similar code of conduct

[tommorris]

I recently discovered Contributor Covenant. It's basically a Code of Conduct for contribution to FLOSS projects.

Unless there's any strong objections from frequent contributors, I'm going to suggest that we adopt v1.1.0 of it.

This is in keeping with the broad principles of the draft code of conduct already in use by the IndieWeb community.

[tommorris]

An alternative to this is to simply adopt the IndieWebCamp code of conduct. This might be easier.

[kevinmarks]

django's language is more explicitly inclusive rather than warning: https://www.djangoproject.com/conduct/

[kylewm]

These all seem basically good. I like Django's as-is or using IWC's as an opportunity to improve it to cover more project/development-specific cases.

The really challenging part to me is when the bad behavior happens outside of the event/community/site. In the Opal case, someone filed an issue saying a contributor should be removed because he said something transphobic in an @-reply on Twitter, and people argued that that space was outside of the project and Github so was irrelevant -- I wish all three CoC's did more to be explicit about whether they do or do not cover behavior outside the community. Of course, I know it's case-by-case, and bad enough behavior warrants consequence regardless of where it happens.