Oh, this is really cool. So when I create a "card" on zube, it automatically creates an issue on github. And when I drag the card to "done" on your trello-like board, it marks the issue as closed in github. The zube interface definitely adds a lot of clarity with colours and birds-eye view. I'm excited to use this! I think the onboarding could make it easier to quickly understand this much (initially, I falsely assumed a "ticket" corresponded to one github issue).

I just pushed to github with a commit message that closed the issue, (git commit -m "... closes #1", as per https://help.github.com/articles/closing-issues-via-commit-m...) and sure enough, the "card" is now marked as complete in zube, with a handy hyperlink to the corresponding commit in github. The instant email confirmation ("Ticket #n closed") from Zube could be pretty handy too, as the team grows. Nice work!