Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  James Myers:
     Merge remote-tracking branch origin/pr/257 ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/27917832 )
  Joseph Palermo:
     Backfill API documentation for Info endpoint ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/27917727 )
     Backfill API documentation for files endpoint. ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/27917470 )
     Remove code and tests for old v1-style files endpoint support ( Travis created: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/27916632 )
  Julz Friedman:
     Organization summary respects visibility permissions ( Travis Unknown )

Signed-off-by: James Myers <jmyers@pivotallabs.com>