Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  James Myers and Joseph Palermo:
     Run unit specs before integration and api specs ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/30311575 )
     Add api endpoint for killing a specific application instance ( Travis Unknown )
  Matthew Sykes:
     Refactor space summary to use bulk api from hm9k ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/30283533 )