[finishes #47383555] Upgrade mongodb from 2.2.1 to 2.2.4
yeti: Bump
cloud_controller_ng: Bump

f31163b mark app as needs staging after changing stack
4517794 changed App#mark_for_staging to accept options
f882556 Include Code Climate badge
f5dd275 Add nice comment explaining how parallel staging requests are handled.
Merge git://github.com/cloudfoundry/cf-release