From http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html:
- 1st line: Capitalized, short (50 chars or less) summary
- Wrap more comments at 72 columns
- Use – or * as a bullet, left justify
From https://github.com/torvalds/linux/pull/17#issuecomment-5654674:
- Pull requests should have a signed tag