gitlabhq/gitlabhq — pull request #7663 by Razer6 (2014-09-01 16:17:21+00:00)
Title: 'all' is not a valid username

#### What does this PR do?

This PR adds `all` the blacklist. With the feature of mentioning all usernames of @maxlazio, this username is not valid anymore to avoid clashes between username lookup and mentioning all teammembers.