* conditionally install and use nvidia-docker
* status statements, and -y flag for install
* add example, remove unnecessary ppa
* rename custom script, remove print statement, update example
* add Dockerfile
* fix path in Dockerfile
* update Docker images to use service account
* updated docs, changed default docker repo for gpu skus
* make timing statements more verbose
* remove unnecessary script
* added gpu docs
* fix up docs and numba example