First draft of the new CoC

This is a first, rough draft of the CoC. It is not yet complete, and so is not ready for merging, but I would like everyone to start getting your eyes on it. I ended up basing it primarily on the [Citizen Code of Conduct](http://citizencodeofconduct.org/), which the nodebots.io forum's CoC is also based on.

The most notable thing missing is contact information for people other than myself. I'm going to reach out to some other people, based on @dshaw's suggestions, in the morning to see if they are willing to act as points of contact. If you want to be a point of contact as well, *please let me know*!

Overall I'm pleased with direction the document is taking, but it currently doesn't do a good job of explaining the kind of community we want to have and, as a result, what our values are. I'm not sure that this CoC is the best place for that given its tone, so I'm starting to think about a separate document that is more positive, less specific, and less legalistic. What does everyone else think?