Updating our ruby protobuf models for BBS

Install protobuf + ensure your local bbs directory is @ origin/master

$ brew install protobuf
$ cd $GOPATH/src/code.cloudfoundry.org/bbs/models
$ git co origin/master
$ git pull
$ z cloud_controller_ng
$ ./scripts/generate-bbs-models.sh

Be aware of changes that necessitate updating our codebase