Keywords and the status to apply to fixed issues can be defined in Admin -> Settings.

Default keywords:
- for referencing issues: refs, references, IssueID
- for fixing issues: fixes,closes
There's no default status defined for fixed issue. You'll have to specify it if you want to enable auto closure of issues.

Example of a working commit message: "This commit references #1, #2 and fixes #3"

git-svn-id: https://svn.redmine.org/redmine/trunk@473 e93f8b46-1217-0410-a6f0-8f06a7374b81