Bump cloudfoundry/cloud_controller_ng:

  Ian Lesperance and Matthew Horan:
     Bump vcap_common ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/10293437 )
  Mark Hall and Ryan Tang:
     Add documentation_url to services ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/10261017 )
  John Foley:
     Merge pull request #76 from geapi/refactor_for_custom_buildpacks ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/10256857 )
  Georg Apitz:
     Added spec for cloud controller config. ( Travis Unknown )