Add Ruby upgrade instructions
Be more specific about what Ruby to use
New gem versions

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Merge branch 'ruby_update' of /home/git/repositories/gitlab/gitlabhq
Here is undefined.
Merge branch 'diy' of /home/git/repositories/gitlab/gitlabhq
Update gitlab-linguist version

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Fix markdown tests

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Merge branch 'update/gems' of /home/git/repositories/gitlab/gitlabhq