Updates Gollum, Ports "Add links and status for omniauth"

Latest Gollum from upstream (if you update your gollum independently it should just be one commit)

Ported this patch https://github.com/arr2036/gollum/commit/32de2cad920ccc6e955b8e19f6e23c2b3b4c8964/diff to work with the latest code.