Example file at Antoine's request. Just don't forget, very rough and not at all finished. =) We probably can't use something like this until Python 3.5 in order to make sure everyone uses commit messages that make sense, but you can get a sense of whether it has a chance of working.

I should also mention that it would be easy to have multiple outputs, e.g. a reST one that links to the actual commit as well as the issue in order to have a pretty version for the website, etc.