@zzet causes the following:
```
/Users/jeroen/.rvm/gems/ruby-2.0.0-p247@gitlabhq/gems/backports-3.3.5/lib/backports/tools.rb:328:in `require': /Users/jeroen/Development/gitlabhq/app/models/project.rb:48: syntax error, unexpected ',', expecting => (SyntaxError)
...nts: { created_at: :desc } ) }, foreign_key: 'project_id'
...                               ^
```