WIP - Reorganize OpenShift Docker image builds

Will manage release versions of image builds
STI builder also allows specifying `TEMP_DIR` which is then bind mounted as temporary dir for build. See [build.sh](https://github.com/openshift/origin/blob/master/images/builder/docker/sti-builder/build.sh#L22) and [sti.go](https://github.com/openshift/origin/blob/master/pkg/build/strategy/sti.go#L77).