tiimgreen/github-cheat-sheet — pull request #28 by Kwpolska (2014-04-17 11:29:52+00:00)
Title: Issues can also be closed by resolve(|s|d)

As documented in https://help.github.com/articles/closing-issues-via-commit-messages (to which the section links on the end!). resolve* was not there from the very beginning, though — and thus many people (get off my lawn!) don’t know about it.