Migrate issues to GitHub / Waffle.io

[Igor Santos]

GitHub is awful for issue management but indeed is a good place for code sharing -and developer profile building. Thus, we could move our BitBucket issues there and using Waffle.io or HuBoard to manage the tickets.

[Igor Santos]

got trouble trying to migrate issues to github: https://github.com/jeffwidman/bitbucket-issue-migration/issues/61

however, this seems to be the best way to do it. After it, we can rename labels to suit Waffle's patterns - HuBoard is paid now, so we're sticking with Waffle.