Most yml files are ignored in gitlab/config/, except resque.yml
=> add it to the list of ignored files.

Provide an omniauth.rb.sample file to avoid encouraging end-users to commit
their provider access details (passwords or api tokens) into their git
repositories.

Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>

It would be better not include either rbenv or a specific rbenv version
with gitlab.