update gitlab to 8.5

We have to update 22 gems as per http://debian.fosscommunity.in/status/?appname=gitlab&sort=satisfied

@balasankarc can you provide a txt output which I can just copy into a gitlab issue? (make creating update issues like this easier, ie, - [ ] gem GemfileVersion debVersion)

@rahulkrishnanfs @sudheeshshetty @isaagar @debku @balasankarc pick any once you complete #71 (closed). Refer https://wiki.debian.org/Teams/Ruby/Packaging/newUpstreamRailsApp

• 1, omniauth-saml, ~> 1.5.0, 1.4.1-1
• 2, gitlab_git, ~> 8.2, 7.2.24-1 - stalled (waiting for rugged) @pravi
  3 gitlab_omniauth-ldap, ~> 1.2.1, 1.0.4-4
• 4 fog, ~> 1.36.0, 1.34.0-3 -WIP @rahulkrishnanfs
  5, github-markup, ~> 1.4.0, 1.3.3+dfsg-1 - update not needed for 8.5.8
  6 ace-rails-ap, ~> 2.0.1, 3.0.3-2
• 7 gitlab_emoji, ~> 0.3.0, 0.2.1-1 - Pending upload to experimental
• 8 request_store, ~> 1.2.0, 1.1.0-1
• 9 actionmailer, = 4.2.6, 2:4.2.5.2-2
• 10 actionview, = 4.2.6, 2:4.2.5.2-2
• 11 activejob, = 4.2.6, 2:4.2.5.2-2
• 12 activemodel, = 4.2.6, 2:4.2.5.2-2
• 13 omniauth-oauth2, >= 1.3.1, 1.2.0-3
• 14 ruby-saml, >= 1.1.1, ~> 1.1