Bump src/cloud_controller_ng

Bump cloudfoundry/cloud_controller_ng:
  Sarah Chandler:
     Merge pull request #103 from cloudfoundry/fix-cc-staging-clobbering ( Travis started: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/12498845 )
  Alex Suraci:
     fix clobbering app updates during staging ( Travis Success: https://travis-ci.org/cloudfoundry/cloud_controller_ng/builds/12498359 )