DRAFT of development process for discussion.

might be better to encourage Cross-Repository Issue References (https://github.com/blog/967-github-secrets) so that the generated links will work even before the code is merged into the primary repository. Will even work for closing issues (https://github.com/blog/1439-closing-issues-across-repositories) which will help developers/users see that code fixing a given issue is available even if it hasn't been merged in - at least for those with permission to close issues.